Best Caramelized Onion Quiche Recipes

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CARAMELIZED ONION, MUSHROOM AND GRUYERE QUICHE WITH OAT CRUST



Caramelized Onion, Mushroom and Gruyere Quiche with Oat Crust image

Provided by Ellie Krieger

Categories     main-dish

Time 2h5m

Yield 6 servings

Number Of Ingredients 17

Nonstick cooking spray
3/4 cup rolled oats
1/2 cup all-purpose flour
1/4 teaspoon salt
3 tablespoons cold, unsalted butter, cut into small pieces
3 tablespoons cold, low-fat buttermilk
4 teaspoons olive oil
1 large onion, sliced thinly into half moons
8 ounces sliced mixed mushrooms, such as cremini, oyster, shiitake
1/2 teaspoon salt
1/4 teaspoon freshly ground black pepper
1/4 teaspoon dry mustard
1 tablespoon chopped fresh thyme leaves (or 1 teaspoon dry)
3 large eggs
3 egg whites
1 cup evaporated fat-free milk (not condensed milk)
2/3 cup grated Gruyere cheese (about 1-ounce)

Steps:

  • Preheat the oven to 400 degrees F. Spray a 9-inch pie dish with cooking spray.
  • To prepare the crust, put the oats, flour and salt in the bowl of a food processor and pulse 3 times to combine. Add the butter and pulse about 12 times, until you get a pebbly course texture. Add the buttermilk and pulse 3 to 5 times more to combine. Form the mixture into a ball and place it between 2 large pieces of waxed paper. Roll out into a circle about 10 inches in diameter.
  • Remove the top sheet of waxed paper. Transfer the crust, still on the other piece of waxed paper to the pie dish, then remove the waxed paper from the top. Press the crust gently into the dish. Bake for 9 minutes, then let cool.
  • To prepare the filling, heat 2 teaspoons of oil in a large nonstick pan over a medium-low heat. Add the onion and cook, stirring occasionally, until golden brown and caramelized, about 20 minutes. Transfer the onions to a bowl. Add the remaining 2 teaspoons of oil to the pan and heat over a medium-high heat. Add the mushrooms and cook, stirring occasionally, until they have released their water and begin to brown, about 6 minutes. Add the onions back to the pan, stir in the salt, pepper, mustard and thyme.
  • In a medium bowl whisk together the eggs, egg whites and evaporated milk.
  • Sprinkle the cheese into the pie crust. Top with the mushroom-onion mixture and pour the egg mixture on top. Reduce oven temperature to 350 degrees F. Bake for 35 minutes or until knife inserted in the middle comes out clean. Let stand for 5 minutes before cutting into 6 wedges and serving.
  • Excellent source of: Protein, Riboflavin, Phosphorus, Selenium
  • Good source of: Vitamin A, Niacin, Vitamin D, Pantothenic Acid, Calcium, Iodine, Iron, Potassium

Nutrition Facts : Calories 270, Fat 14 grams, SaturatedFat 6 grams, Cholesterol 125 milligrams, Sodium 430 milligrams, Carbohydrate 24 grams, Fiber 2 grams, Protein 14 grams

EASY CREAM CHEESE, CARAMELIZED ONION AND BACON QUICHE



Easy Cream Cheese, Caramelized Onion and Bacon Quiche image

This is such a good Quiche, hope you enjoy it as much as we do. My family loves Quiche with homemade biscuits or even whole wheat toast. I serve it with apple butter, jams and jellies. Found this one on Picky Palate web site.

Provided by Straws Kitchen(*o *)

Categories     Other Breakfast

Number Of Ingredients 11

1 refrigerated 9-inch pie crust (or your homemade)
1/2 lb bacon
1 large sliced white onion
8 eggs
1/4 c milk
1/4 tsp sea salt
1/4 tsp freshly ground black pepper
5 oz softened philadelphia cream cheese
3/4 c shredded cheddar cheese
2 Tbsp fresh chopped parsley
1 Tbsp fresh chopped cilantro

Steps:

  • 1. Preheat oven to 350 dF and spray a 9-inch pie plate with non-stick cooking spray.
  • 2. Heat a large skillet over medium heat and cook bacon, stirring until browned, about 10 minutes. Transfer bacon to a paper towel lined plate and discard drippings.
  • 3. Add onions and cook, stirring until onions are golden and caramelized, about 15 minutes. Remove from heat.
  • 4. Unroll pie crust, lay in bottom and up edges of prepared pie plate. With fork, poke holes in bottom and partially bake crust for 8 to 10 minutes, then remove from oven.
  • 5. Add eggs, milk, salt and pepper to a large bowl, whisking to combine.
  • 6. Layer cooked onions over bottom of partially baked crust, top with bacon pieces and cream cheese pieces.
  • 7. Pour eggs over bacon and top with cheese, parsley and cilantro.
  • 8. Bake for 30 to 35 minutes, until eggs are set and edges are browned.
  • 9. Remove and let cool for 5 minutes before cutting into pie shaped wedges...serve with homemade biscuits, butter and apple butter.

CARAMELIZED ONION AND BLUE CHEESE QUICHE



Caramelized Onion and Blue Cheese Quiche image

This is a delicious quiche for brunch or dinner. I made this recipe up using a base quiche recipe I have used in the past and ingredients I had on hand. It turned out awesome!

Provided by lcdenner

Categories     Savory Pies

Time 1h15m

Yield 1 pie, 6-8 serving(s)

Number Of Ingredients 9

1 tablespoon olive oil
2 small onions, peeled halved and sliced
1 pie crust (pre made)
2 -3 ounces blue cheese (crumbled) or 2 -3 ounces gorgonzola (crumbled)
5 large eggs
3/4 cup heavy cream
1/2 cup sour cream
1 teaspoon tarragon
salt and pepper (to taste)

Steps:

  • Preheat oven to 375 degrees.
  • In a cast iron skillet or large saute pan, heat olive oil over medium heat. When oil is hot, add sliced onions, season with salt, and saute until caramelized (approx 20-30 minutes).
  • Put pie crust in 8-9 inch pie pan or tart pan. Bake for 6 minutes (you may want to put parchment paper and rice or dry beans over the crust to keep it from bubbling up).
  • In a medium bowl whisk eggs, heavy cream, sour cream, tarragon and salt and pepper until combined.
  • Remove pie crust and discard parchment paper (if used). Spread crumbled blue cheese on the bottom of pie crust. Cover the crumbled cheese with the caramelized onions and spread evenly to cover the bottom of the crust. Poor egg and cream mixture over the onions and cheese.
  • Bake for 35-40 minutes until golden brown and set in the middle. The filling may rise. Allow to cool slightly and settle in crust before serving.

CARAMELIZED ONION BROCCOLI QUICHE



Caramelized Onion Broccoli Quiche image

This is a wonderful for brunch or for supper, paired with a green salad. The combination of broccoli, sweet onions and feta cheese is truly delicious. -Kim Pettipas of Oromocto, New Brunswick

Provided by Taste of Home

Categories     Breakfast     Brunch

Time 1h45m

Yield 6 servings.

Number Of Ingredients 11

3 cups sliced sweet onions
1 teaspoon sugar
1/2 teaspoon salt
2 teaspoons olive oil
2 cups frozen shredded hash brown potatoes, thawed
1 tube (11 ounces) refrigerated breadsticks
3 cups frozen chopped broccoli, thawed and drained
1 cup crumbled feta cheese
2 large eggs
2 large egg whites
3/4 cup fat-free milk

Steps:

  • In a large nonstick skillet, cook the onions, sugar and salt in oil over low heat for 40 minutes or until onions are softened and liquid has evaporated. Reduce heat to medium-low; add hash browns. Cook 8-10 minutes longer or until potatoes are golden brown. Remove from the heat and set aside., To make crust, unroll breadstick dough onto a lightly floured surface and separate into strips. Pinch several breadsticks together, end to end, forming a rope. Holding one end of rope, loosely coil dough to form a circle. Add remaining breadsticks to coil, one at a time, pinching ends together. Tuck end under; pinch to seal. Cover and let rest for 10 minutes., Roll into a 10-1/2-11-in. circle. Transfer to an ungreased 9-in. pie plate. Spoon onion mixture into crust. Top with broccoli and cheese., In a large bowl, whisk the eggs, egg whites and milk; pour over cheese (pie plate will be full). Bake 350° for 40 minutes. Cover edges with foil. Bake 10-12 minutes longer or until a knife inserted in the center comes out clean. Let stand for 10 minutes before cutting.,

Nutrition Facts : Calories 365 calories, Fat 12g fat (5g saturated fat), Cholesterol 94mg cholesterol, Sodium 928mg sodium, Carbohydrate 50g carbohydrate (0 sugars, Fiber 5g fiber), Protein 14g protein.

CARAMELIZED ONION, FETA AND SPINACH QUICHE



Caramelized Onion, Feta and Spinach Quiche image

Make and share this Caramelized Onion, Feta and Spinach Quiche recipe from Food.com.

Provided by WonderMima

Categories     Savory Pies

Time 1h10m

Yield 4-6 serving(s)

Number Of Ingredients 9

1 pastry crust
2 cups fresh spinach, washed and dried
3/4 cup crumbled feta cheese
2 onions, caramelized
4 eggs
1/2 cup creme fraiche (or sour cream)
3/4 cup milk
1/2 teaspoon salt
1/2 teaspoon ground pepper

Steps:

  • Place the pie crust in a deep dish pie pan. Whisk together eggs, milk, creme fraiche, salt and pepper.
  • Place half the spinach leaves in a layer over the egg mixture, top with the feta, caramelized onions.
  • Layer the remaining spinach on top and press down to get as much egg over top as possible.
  • Bake for 25 minutes at 350 (make sure your oven is preheated). Check at that point for firmness. If it needs another 5 minutes put it back in.
  • You may need to cover the crust i half way through so it doesn't darken too much.

Nutrition Facts : Calories 534.4, Fat 38.7, SaturatedFat 17.4, Cholesterol 283.7, Sodium 955.7, Carbohydrate 31.3, Fiber 2.8, Sugar 4.1, Protein 16.1

CARAMELIZED ONION, SMOKED TURKEY, MUSHROOM AND GRUYERE QUICHE WI



Caramelized Onion, Smoked Turkey, Mushroom and Gruyere Quiche Wi image

This recipe is adapted from Ellie Krieger. I've added Smoked turkey, bacon or ham would work just as well. the crust is surpisingly good with the mushroom and cheese.

Provided by Hopes in the kitchen

Categories     One Dish Meal

Time 2h

Yield 1 pie, 6 serving(s)

Number Of Ingredients 18

cooking spray
3/4 cup rolled oats
1/2 cup all-purpose flour
1/4 teaspoon salt
3 tablespoons unsalted butter, cold, cut into small pieces
3 tablespoons cold low-fat buttermilk
4 teaspoons olive oil
1 large onion, sliced thinly into half moons
8 ounces sliced mixed mushrooms, such as cremini, oyster, shiitake
1/2 teaspoon salt
1/4 teaspoon fresh ground black pepper
1/4 teaspoon dry mustard
1 tablespoon chopped fresh thyme leave (or 1 teaspoon dry)
3 large eggs
3 egg whites
1 cup fat-free evaporated milk (not condensed milk)
1/4 lb slice of smoked low fat smoked turkey (cubed)
2/3 cup grated gruyere cheese (about 1-ounce)

Steps:

  • Preheat the oven to 400 degrees F. Spray a 9-inch pie dish with cooking spray.
  • To prepare the crust, put the oats, flour and salt in the bowl of a food processor and pulse 3 times to combine. Add the butter and pulse about 12 times, until you get a pebbly course texture. Add the buttermilk and pulse 3 to 5 times more to combine. Form the mixture into a ball and place it between 2 large pieces of waxed paper. Roll out into a circle about 10 inches in diameter.
  • Remove the top sheet of waxed paper. Transfer the crust, still on the other piece of waxed paper to the pie dish, then remove the waxed paper from the top. Press the crust gently into the dish. Bake for 9 minutes, then let cool.
  • To prepare the filling, heat 2 teaspoons of oil in a large nonstick pan over a medium-low heat. Add the onion and cook, stirring occasionally, until golden brown and caramelized, about 20 minutes. Transfer the onions to a bowl. Add the remaining 2 teaspoons of oil to the pan and heat over a medium-high heat. Add the mushrooms and cook, stirring occasionally, until they have released their water and begin to brown, about 6 minutes. Add the onions back to the pan, stir in the salt, pepper, mustard and thyme.
  • In a medium bowl whisk together the eggs, egg whites and evaporated milk.
  • Sprinkle the cheese into the pie crust. Top with the mushroom-onion mixture, add cubed smoked turkey, and pour the egg mixture on top. Reduce oven temperature to 350 degrees F. Bake for 35 minutes or until knife inserted in the middle comes out clean. Let stand for 5 minutes before cutting into 6 wedges and serving.

CARAMELIZED ONION AND BACON MINI QUICHE



Caramelized Onion and Bacon Mini Quiche image

Make and share this Caramelized Onion and Bacon Mini Quiche recipe from Food.com.

Provided by Stardustannie

Categories     Lunch/Snacks

Time 55m

Yield 24 mini quiche

Number Of Ingredients 7

2 sheets ready rolled shortcrust pastry dough
2 teaspoons oil
1 large onion, finely chopped
125 g bacon, finely chopped
3 teaspoons coarse grain mustard
2 eggs
125 ml milk

Steps:

  • Preheat oven to 200c.
  • Lightly grease 24 mini tart tins.Lay the pastry sheets on a work surface and cut pout 24 shapes to fit the tin. Line the tins with pastry.
  • Heat the oil in a large saucepan over low-med heat add the onion and cook for about 30 minutes, or until golden (do not rush this step). Transfer to a bowl to cool.
  • Add the bacon to the pan and cook until crisp.
  • Add to the onion mixture, stir in mustard and season with salt and pepper.
  • Spoon a small amount into tart case.
  • Beat the eggs with the milk and pour over the bacon and onion mixture.
  • Bake for 15-20 min or until puffed and golden.
  • Remove from tins while warm -- serve warm or cool.

Nutrition Facts : Calories 118.2, Fat 8.5, SaturatedFat 2.4, Cholesterol 21.9, Sodium 133.2, Carbohydrate 8.1, Fiber 0.3, Sugar 0.3, Protein 2.3

SPINACH, CARAMELIZED ONION, AND TOMATO QUICHE



SPINACH, CARAMELIZED ONION, AND TOMATO QUICHE image

Categories     Egg     Dinner

Yield 6 slice

Number Of Ingredients 14

2 tsp. olive oil, extra-virgin
3 medium onions, chopped
2 cloves garlic cloves, minced (medium)
1 tsp sugar
10 oz. chopped frozen spinach, thawed and squeezed dry
10 oz pizza dough, refrigerated
3/4 cups fat-free evaporated milk
2 large eggs, lightly beaten
1/4 cup light sour cream
1 large egg white, lightly beaten
1/8 tsp. black pepper, freshly ground
1/8 tsp. ground nutmeg
1/2 cup shredded reduced-fat Monterey Jack cheese
12 medium cherry tomatoes, halved

Steps:

  • Heat a large nonstick skillet over medium-high heat. Swirl in the oil, then add the onions, garlic, and sugar. Cook, stirring occasionally, until the onions are lightly golden, about 8 minutes. Add the spinach and cook 2 minutes longer; remove from the heat and let cool 10 minutes. Preheat the oven to 350 degrees F. Spray a 9-inch pie plate with nonstick spray. Place the dough on a lightly floured work surface and shape it into a 4-inch circle. Cover lightly with plastic wrap and let rest 10 minutes. Roll the dough into an 11-inch circle; fit the dough into the pie plate, and flute the edges. Combine the milk, eggs, sour cream, egg white, salt, nutmeg, and pepper into a medium bowl. Sprinkle the cheese over the bottom of the pie crust. Top evenly with spinach mixture, then pour in the egg mixture. Arrange the tomato halves, cut-side up, on top of the quiche, in a circular pattern. Place on a baking sheet and bake until quiche is just set, about 45 minutes. Remove from the oven and let stand 10 minutes before cutting. Serve immediately or at room temperature. Yields 1/6 quiche per serving.

MUSHROOM, CARAMELIZED ONION, SPINACH, SWISS QUICHE



Mushroom, Caramelized Onion, Spinach, Swiss Quiche image

When I set out to make quiche, it's not on purpose. A quick scan of what's in the refrigerator usually makes that decision for me. That's where this recipe came from. Just fooling around with what I had. When cooking for two, this makes a nice dinner and leftovers for lunch. A salad and a nice Pinot Grigio pairs...

Provided by Amy CooksToo

Categories     Other Main Dishes

Number Of Ingredients 11

1 9" pie crust (i usually make my own from scratch)
1 large sweet onion, thinly sliced
2 Tbsp butter
15-20 baby bella mushrooms, thin sliced
1 tsp fresh thyme leaves
handful baby spinach leaves
5 large eggs
1 c half-and-half or cream
1 c grated cheddar cheese
6 swiss cheese slices
To taste salt and pepper

Steps:

  • 1. Preheat the oven to 350 F.
  • 2. Place your pie crust in a 9-inch pie plate and flute the edges. If desired, brush the edges of the crust with a bit of half-and-half or an egg wash.
  • 3. Caramelize the onions in the butter. This means cook slowly on low heat until they are a beautiful golden brown. If you're not using a sweet onion, add a pinch of sugar. Remove to a ramekin. Sauté the mushrooms with thyme in the same pan until all the liquid cooks off. Season with salt and black pepper and let cool.
  • 4. In a 4 cup measuring cup, whisk together the eggs and half-and-half in a large bowl. Add a pinch of salt and pepper. Stir in most of the cheddar cheese.
  • 5. Place the slices of Swiss cheese in the base of the pie crust. Next layer the baby spinach then the mushrooms. Using tongs drop caramelized onions on top of spinach and mushrooms. Pour egg mixture into pie and stir to distribute evenly. Sprinkle more grated cheddar on top if you have any left.
  • 6. Bake the quiche for about 50-60 minutes, or until a knife comes out clean from the center. Check the quiche around 35-40 minutes and if the crust is starting to brown too quickly, cover (just the crust or parts of it) with aluminum foil to protect it. Using a glass pan prevents this from happening. Let rest for 5 minutes before cutting. Serve warm! A salad and a nice Pinot Grigio pairs beautifully!

BACON, CHEESE, AND CARAMELIZED ONION QUICHE



Bacon, Cheese, and Caramelized Onion Quiche image

My husband said this is the best quiche he's ever tried! The combination of caramelized onion, bacon, and Cheddar cheese is perfect.

Provided by Karen

Categories     100+ Breakfast and Brunch Recipes     Eggs     Quiche

Time 2h25m

Yield 8

Number Of Ingredients 11

4 slices bacon
1 (9 inch) unbaked pie crust
¼ cup butter
1 medium onion, finely chopped
1 egg, beaten
2 eggs
1 ¼ cups sour cream
¼ cup cream cheese, softened
¼ teaspoon salt
⅛ teaspoon ground black pepper
1 cup shredded Cheddar cheese

Steps:

  • Preheat the oven to 350 degrees F (175 degrees C).
  • Fry bacon in a large skillet over medium-high heat, turning occasionally, until crispy, about 10 minutes. Drain bacon slices on paper towels. Let cool 10 minutes. Crumble and set aside.
  • Roll out pastry crust into a circle using a lightly floured rolling pin. Line a 9-inch pie pan with crust. Prick holes into the base of the dough using a fork.
  • Bake crust in the preheated oven on the middle rack for 15 minutes.
  • Remove pastry crust from the oven. Brush crust with beaten egg. Return crust to the oven and bake 5 minutes more.
  • Heat butter in a pan over medium heat and stir in onion. Cook and stir until onion has softened and turned translucent, about 5 minutes. Reduce heat to low and continue cooking and stirring until onion is very tender and dark brown, about 40 minutes more.
  • Whisk 2 eggs together in a bowl using a fork. Add sour cream and cream cheese and beat using an electric mixer until well combined. Beat in salt and pepper.
  • Spread caramelized onions with remaining butter onto pastry crust. Sprinkle with 1/2 the Cheddar cheese. Place crumbled bacon evenly over the top. Pour egg mixture over bacon. Top with remaining Cheddar cheese.
  • Bake quiche in the preheated oven until golden and fluffy, about 30 minutes. Let cool 10 minutes before serving.

Nutrition Facts : Calories 389.8 calories, Carbohydrate 13.7 g, Cholesterol 123.5 mg, Fat 32.5 g, Fiber 1.1 g, Protein 11.3 g, SaturatedFat 16.6 g, Sodium 505.6 mg, Sugar 0.9 g

SPINACH, CARAMELIZED ONION, AND FETA QUICHE



SPINACH, CARAMELIZED ONION, AND FETA QUICHE image

Categories     Cheese     Egg     Brunch     Bake     Vegetarian

Yield 8 People

Number Of Ingredients 12

2 teaspoons olive oil
3 cups chopped onion
1 teaspoon sugar
1/2 teaspoon salt
2 cups frozen Southern-style hash brown potatoes, thawed
1 (11-ounce) can refrigerated soft breadstick dough
Cooking spray
1 (10-ounce) package frozen chopped spinach, thawed, drained, and squeezed dry
1 cup fat-free milk
3 large egg whites
2 large eggs
1 1/4 cups (5 ounces) crumbled feta cheese

Steps:

  • Preheat oven to 350°. Heat olive oil in a large nonstick skillet over medium heat. Add onion, sugar, and salt; cook for 30 minutes or until golden brown, stirring occasionally. Stir in potatoes, and cook for 5 minutes or until lightly browned. Remove from heat. Unroll dough, separating into strips. Working on a flat surface, coil one strip of dough around itself in a spiral pattern. Add second strip of dough to the end of the first strip, pinching ends together to seal; continue coiling the dough. Repeat procedure with the remaining dough strips. Cover and let dough rest for 10 minutes. Roll dough into a 12-inch circle, and fit into a 10-inch deep-dish pie plate coated with cooking spray. Spread potato mixture in bottom of prepared crust, and top with spinach. Combine milk, egg whites, eggs, and cheese; pour the milk mixture over the spinach. Bake at 350° for 1 hour or until set, shielding crust with foil after 50 minutes. Let stand 10 minutes before serving.

CARAMELIZED ONION QUICHE



CARAMELIZED ONION QUICHE image

Categories     Egg

Number Of Ingredients 11

1 (14.1 oz) pkg refrigerated piecrust
3 large sweet onions, slice ( about 1 1/2 lb)
2 T olive oil
1/2 cup fresh flat leaf parsley
6 cooked bacon slices, crumbled
2 cups (8 oz) shredded Gruyere cheese
1 1/2 cups half and half
4 large eggs
1/2 t salt
1/4 t freshly ground pepper
1/4 t ground nutmeg

Steps:

  • Preheat 425. Unroll piecrusts; stack on a nightly greased surface. Roll stacked piecrusts into a 12-inch circle. Fit piecrust into a 10 inch deep dish tart pan with removable bottom; press into fluted edges. Trim off excess piecrust along edges. Line piecrust with aluminum foil or parchment paper, and film with pie weights or dried beans. Place pan on a foil lined baking sheet. Bake 12 minutes. Remove weights and foil, and bake 8 more minutes. Cool completely on baking sheet on a wire rack about 15 minutes. Reduce oven temperature to 350 Meanwhile, cook onions in hot oil in large skillet over medium-high heat, stirring often, 15-20 minutes or until onions are caramel colored. Remove from heat, and stir in parsley and bacon. Place half of onion mixture in tart shell, and top with half of cheese; repeat with remaining onion mixture and cheese. This together half and half and next 4 ingredients; our over cheese Bake at 350 for 40-45 minutes or until set. Cool on baking sheet on a wire rack 15 minutes before serving.

CARAMELIZED ONION AND GORGONZOLA QUICHE



Caramelized Onion and Gorgonzola Quiche image

Yield makes one 8 x 11-inch quiche

Number Of Ingredients 10

All-purpose flour, for dusting
Tart Dough (opposite)
1 tablespoon extra-virgin olive oil
1 pound onions, cut crosswise into rings
2 large eggs
1/2 cup milk
1/2 cup heavy cream
1 teaspoon coarse salt
Freshly ground pepper
2 ounces Gorgonzola dolce

Steps:

  • On a lightly floured work surface, roll out the dough to 1/4 inch thick. Press the dough onto the bottom and up the sides of an 8 × 11-inch rectangular tart pan with a removable bottom; trim the dough flush with the top edge of the pan. Prick the bottom all over with a fork. Transfer to a large rimmed baking sheet. Freeze until firm, about 30 minutes. Preheat the oven to 400°F.
  • Line the tart shell with parchment paper, and fill with pie weights or dried beans. Bake until the dough starts to feel firm on the edges, about 20 minutes. Remove the parchment and weights; continue baking until the crust is pale golden brown, about 10 minutes. Let cool completely on a wire rack. Leave the oven on.
  • Heat the oil in a large, heavy-bottomed skillet over low heat until hot but not smoking. Cook the onions, stirring frequently, until golden brown, about 30 minutes. Let cool.
  • Whisk the eggs, milk, cream, and salt in a medium bowl; season with pepper. Crumble in the cheese, and stir in the caramelized onions. Pour the mixture into the tart shell; bake until puffed and pale golden brown, 30 to 35 minutes. Let cool at least 30 minutes before serving.

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