Best Onion Gratin Recipes

PARMESAN-CRUSTED AU GRATIN POTATOES AND ONION

Steps:

• Place potatoes into a large pot and cover with water; add salt and bring to a boil. Reduce heat to medium-low and simmer until just beginning to soften, 15 to 20 minutes; drain.
• Melt butter in a saucepan over medium heat; add flour and whisk until the mixture thickens, 1 to 2 minutes. Pour milk and heavy cream into the saucepan; cook and stir until smooth, 2 to 3 minutes. Melt Cheddar and Asiago cheese into the butter mixture; cook while stirring continually until the mixture is smooth and creamy, 1 to 2 minutes. Season the sauce with salt and pepper.
• Preheat oven to 400 degrees F (200 degrees C). Butter a 9x13-inch casserole dish.
• Layer about half the sliced potatoes into the bottom of the baking dish. Top the potatoes with sweet onion slices and green onions; pour about 1/3 of the cheese sauce over the onions. Arrange the remaining potato slices into the dish; pour remaining cheese sauce over the potatoes. Sprinkle Parmesan cheese and crushed crackers over the top.
• Bake in the preheated oven until hot in the center and beginning to brown at the edge, about 30 minutes. Sprinkle parsley over the top of the dish to serve.

CRUNCHY BAKED TOMATO & ONION GRATIN

Steps:

• Heat oven to 180C/160C fan/gas 4. Heat half the oil in a pan and gently soften the onions and garlic for 15-20 mins until really soft and sticky but not browned. Put the onions, tomatoes (halve the large ones), herbs, sugar and breadcrumbs in a baking dish, season well and toss together.
• Drizzle with the remaining oil, scatter with a few more herb sprigs and bake for 1 hr until going golden on top and the tomatoes are juicy.

CARAMELIZED VIDALIA ONION AND POTATO GRATIN WITH FRESH SAGE

Steps:

• Preheat oven to 375 degrees F.
• Heat oil and butter in a large saute pan over medium-high heat. Add the onions, season with salt and pepper and cook until caramelized, about 15 to 20 minutes. Remove from the heat and stir in the sage. Let cool slightly.
• Make a layer of potato slices in a 10 by 10 by 2-inch casserole, season to taste with salt and pepper, spread 1/12 of the onion mixture over the potatoes and coat with 2 tablespoons of the cream. Repeat each step to yield 12 layers. Press down gently on the layers, place the dish on a sheet pan and bake, covered for 25 minutes. Remove cover and bake for another 20 to 25 minutes, or until the potatoes are tender and golden brown on top. Let rest 10 minutes before serving.

SPINACH, CARAMELIZED ONION, AND MUENSTER AU GRATIN POTATOES

Steps:

• Preheat an oven to 400 degrees F (200 degrees C). Combine the potatoes and spinach in a 9x13-inch baking dish; set aside.
• Melt 3 tablespoons of butter in a saucepan over medium-low heat. Stir in the onion, and cook until dark brown, about 15 minutes. Stir in the garlic and cook until fragrant, about 1 minute. Add butter and when melted, add flour. Cook and stir until golden, 2 to 3 minutes. Season with salt, and stir in the milk and cream. Bring to a simmer over medium heat; cook and stir until the sauce has thickened, about 10 minutes. Stir in 3/4 of the Muenster cheese until melted, and pour over the potatoes.
• Cover the potatoes with aluminum foil, and bake in the preheated oven 30 minutes. Uncover, and cook 20 minutes more, then sprinkle with the remaining Muenster cheese, return to the oven, and bake until the potatoes are tender and the cheese is bubbly, about 10 minutes more.

BUTTERNUT SQUASH, APPLE, ONION AU GRATIN

Steps:

• Preheat oven to 350. Spray 9- x 11-inch glass baking pan with cooking spray.
• Place flour, salt, and cinnamon into a large plastic bag. Add squash, apples, and onions; shake until lightly dusted.
• In glass dish, layer 1/2 of squash, apples, and sweet onion. Pour 1/2 cup chicken stock over the top, then sprinkle 1/2 of cheese. Layer with remaining squash, apple, and onions. Pour remaining chicken stock over the top, and cover with foil.
• Bake in preheated oven for 40 minutes.
• Take out and sprinkle with bacon crumbles and remaining cheese. Return, uncovered, to oven; bake for another 5 minutes. Let sit for 5 minutes before serving.

FRENCH ONION SOUP POTATO GRATIN

Steps:

• For the caramelized onions: In a large saucepan over medium-high heat, melt the butter. Once melted and bubbling, add a large handful of the onions and cook until translucent, 1 to 2 minutes. Repeat until all the onions have been added. Season with a pinch of salt and black pepper. Reduce the heat to low and cook, stirring occasionally, until the onions turn medium brown, about 30 minutes. If the onions start to get too dark, add 1 to 2 tablespoons of beef stock as necessary. Add the sherry to deglaze the pan. Add the mustard and stir to coat. Season with salt and pepper. Remove from the heat and set aside.
• For the potato gratin: Preheat the oven to 400 degrees F.
• Using a mandoline or a sharp knife, cut the potatoes into thin slices. Do your best to keep the potatoes in a stack--this will make it easier to layer them in the pan. Set the potatoes aside.
• Use the reserved butter wrapper to lightly grease the bottom and sides of a large (12-inch) cast-iron skillet. Discard the wrapper.
• Arrange a thin shingled layer of potatoes in concentric circles around the skillet. Season the potatoes with salt and pepper, then arrange an even layer of caramelized onions on top of the potatoes. Season with salt and pepper.
• In a medium bowl, combine the Gruyere and mozzarella and reserve half for later use. Sprinkle on a layer of the remaining cheese mixture over the onions. Repeat the layers until all the ingredients (not including the reserved cheese) have been used. Press down firmly on the layers to flatten.
• In a large bowl or measuring cup, combine the heavy cream and beef stock and pour over the gratin. Cover the skillet with foil and place on a sheet pan. Bake the potatoes, covered, until the top and edges have begun to brown and the potatoes are tender, 1 hour 15 to 1 hour 30 minutes. You can test by inserting a knife into the potatoes; if it goes in and comes out without resistance, then the potatoes are done.
• Remove the skillet from the oven, remove the foil and turn the broiler on high. Combine the croutons and French fried onions. Cover the gratin with a layer of the crouton mixture followed by the remaining cheese. Broil until golden brown and bubbly, 5 to 8 minutes. Serve and enjoy!

CREAMED CORN GRATIN WITH FRIED ONION RINGS AND BACON

Steps:

• Preheat oven to 350°F. Spread breadcrumbs on rimmed baking sheet. Bake until lightly toasted, about 10 minutes.
• Sauté bacon in large skillet over medium heat until crisp. Using slotted spoon, transfer bacon to paper towels. Transfer 2 tablespoons bacon drippings to heavy large pot; reserve for creamed corn. Discard remaining drippings.
• Place flour in medium bowl. Sprinkle with salt and pepper. Separate red onion slices into rings and toss in flour to coat lightly. Heat 1/2 cup oil in same large skillet over medium-high heat. Working in batches, add onion rings to skillet and cook until golden brown, adding more oil as needed, about 2 minutes per side. Transfer onion rings to paper towels. Mix breadcrumbs, bacon, onion rings, and half of green onions in clean medium bowl. Sprinkle topping with salt and pepper.
• Butter 13x9x2-inch glass baking dish. Add butter to pot with reserved bacon drippings; melt over medium-high heat. Add chopped onion; sauté until light golden and beginning to soften, about 6 minutes. Add frozen corn; sauté 5 minutes. Add milk and cream; bring to boil. Gradually stir in grits and cayenne pepper. Reduce heat and simmer until mixture thickens slightly, about 3 minutes. Remove from heat. Stir in cheese and remaining green onions. Season with salt and pepper. Transfer creamed corn to prepared dish. (Topping and corn can be made 1 day ahead. Cover separately and chill.)
• Preheat oven to 350°F. Bake gratin uncovered 25 minutes. Sprinkle topping over; bake until topping is slightly crisp and creamed corn thickens and is heated through, about 20 minutes longer.

SWEET POTATO, APPLE AND ONION GRATIN

Steps:

• Preheat oven to 350 degrees.
• Butter 13X6 inch oval baking dish.
• Melt butter in heavy large skillet over medium heat.
• Add onions and saute until tender, about 10 minutes.
• Toss apples with flour in medium bowl.
• Arrange half of sweet potatoes in bottom of prepared dish.
• Top with half of apple slices.
• Arrange remaining potatoes and then remaining apples.
• Cover with sauteed onions.
• Pour stock over all.
• Bake until sweet potatoes are tender, about 45 minutes.
• Mix breadcrumbs, cheese and bacon in small bowl, then sprinkle mixture over potatoes.
• Bake an additional 20 minutes.
• Broil until topping browns, if needed.
• Let cool 5 minutes before serving.

SWEET POTATO, ONION, AND APPLE GRATIN

Steps:

• Preheat oven to 400°F. Butter and flour 15x10x2-inch baking dish. Spread 1/3 of potato slices over bottom of dish. Arrange 1/2 of onion slices, then 1/2 of apple slices over. Sprinkle with 1 tablespoon lime juice, 1 tablespoon sugar, and 1/3 cup cream. Dot with 1 tablespoon butter. Sprinkle with salt and pepper. Repeat layering. Arrange remaining potato slices on top. Drizzle with remaining 1/3 cup cream. Dot potatoes with remaining 1 tablespoon butter. Sprinkle with salt and pepper.
• Cover dish with foil. Bake until potatoes and apples are tender, about 45 minutes. Increase oven temperature to 500°F. Remove foil. Bake until potatoes are golden brown, about 10 minutes.

SWEET POTATO-ONION GRATIN

Steps:

• Prepare a grill for medium-high heat. Preheat the oven to 350 degrees F. Grease a 9-by-13-inch baking dish with the butter.
• Oil the sliced sweet potatoes and onions with the canola oil and sprinkle with salt and pepper. Grill the sweet potatoes and onions until slightly charred on each side and just halfway cooked. Set aside.
• Combine the half-and-half, horseradish, thyme, 2 teaspoons salt and 1 teaspoon pepper in a bowl. Sprinkle one-third of the Gruyere in an even layer over the bottom of the prepared baking dish. Layer one-third of the grilled sweet potatoes and onions on top of the Gruyere. Repeat twice¿one-third of the cheese, one-third of the vegetables¿to create three even cheese-vegetable layers. Pour the half-and-half mixture over the top, cover with foil and bake for 35 to 40 minutes. Uncover and continue baking until the sweet potatoes are tender and the gratin is golden brown, another 15 to 20 minutes. Let rest for 15 minutes before serving.

ONION SOUP GRATIN

Steps:

• In a large heavy pot, melt the butter over medium heat. Stir in the leeks, onions and shallots and toss to coat with the butter. Cook onions until they begin to soften. Cover and continue to stir occasionally. When the onions begin to turn golden, turn up the heat to medium high and add the pinch of sugar and nutmeg. Continue to cook until onions turn a rich golden brown. Season onions with salt and pepper. Add red wine and bring to a simmer. Cook for 3-5 minutes. Pour in warm stock and bring to a simmer. Preheat oven to 400 degrees. Ladle soup into ovenproof bowls and place bowls on baking sheet. Top each bowl with slice of bread and sprinkle with cheese. Bake for 15 minutes or until bubbly.

MOM'S CHEDDAR ZUCCHINI, TOMATO, & ONION GRATIN

Steps:

• Preheat oven to 400 degrees Fahrenheit.
• In an 8" x 8" baking dish, lay the zucchini, then the onions, then the tomatoes. Top with a pinch of salt and pepper, then sprinkle the cheddar cheese on top.
• Bake uncovered for 30 minutes, or until the vegetables are tender and the cheese melted.
• Top with fresh basil if desired and serve.

BLUE CHEESE MUSHROOM AND ONION POTATO GRATIN

Steps:

• Heat oil and butter in a skillet; saute the onions until caramalized (about 10-12 minutes) remove with a slotted spoon to a bowl.
• Add in the sliced mushrooms and saute until they loose there moisture (about 10 minutes) transfer to a bowl.
• Set oven to 375 degrees (oven rack to second-lowest position).
• Butter a 3-4 quart casserole dish.
• In a 2-quart saucepan combine the potatoes with the whipping cream (the potatoes on top do not have to be covered completely) bring to a boil; remove from heat and cool to warm (about 30 minutes) leaving the potatoes in the cream.
• Transfer one-third of the potatoes using a slotted spoon to the baking dish, spreading them out in an even layer.
• Sprinkle with HALF of the onions, then HALF of the mushrooms; season with salt and pepper.
• The sprinkle ONE-THIRD of both cheeses over the mushrooms.
• Make another layer of potatoes then the sprinkle the REMAINING onions and mushrooms over the potatoes then another third of both cheeses.
• Make one more layer with the remaining potatoes.
• Top with remaining cheeses.
• Pour any leftover whipping cream evenly over the top and cover tightly with foil.
• Make for 45 minutes.
• Increase the oven temperature to 400 degrees.
• Remove the foil and bake until the top is golden brown, and the potatoes are fork-tender (about 12-15 minutes).
• Let stand for 15 minutes before serving (the mixture will thicken upon standing).

ROASTED LAMB WITH POTATO, ONION AND TOMATO GRATIN

Steps:

• Preheat oven to 450°F.
• Rub bottom of 16x10 gratin pan with split garlic clove.
• Arrange potato slices in bottom of pan.
• Season with salt, pepper, some of the thyme and chopped garlic.
• Add a layer of onions and seasoning.
• Add a layer of tomatoes and seasoning on top.
• Drizzle with wine and oil.
• Trim the thicker portions of fat from the leg of lamb.
• Season with salt and pepper.
• Place lamb on a sturdy cake rake directly on top of gratin pan.
• Roast, uncovered, for about 1 hour and 15 minutes for rare lamb (1 hour and 45 minutes for well-done); turning lamb every 15 minutes, basting with liquid from gratin pan.
• Remove from oven and allow to sit for 20 minutes before carving.

POTATO, CARAMELIZED ONION, AND GOAT CHEESE GRATIN

Steps:

• In a heavy 5- to 6-quart kettle heat oil over moderate heat until hot but not smoking and cook onions with thyme and salt and pepper to taste, stirring occasionally, until golden, about 15 minutes. Reduce heat to moderately low and cook, stirring frequently to keep from scorching, until golden brown. Remove kettle from heat.
• While onions are cooking, bring a large saucepan of salted water to a boil for potatoes. Peel potatoes and cut crosswise into 1/4-inch-thick slices. Add potatoes to boiling water and cook 5 minutes from time water returns to a boil. Drain potatoes well in a colander.
• Preheat oven to 425°F. and lightly oil a 2- to 2 1/2-quart gratin dish or other shallow baking dish.
• Arrange half of potatoes, overlapping slightly, in dish and season generously with salt and pepper. Cover potatoes with onions, spreading evenly, and top with goat cheese. Arrange remaining potatoes, overlapping slightly, over cheese and season generously with salt and pepper. Dot gratin with butter. Gratin may be prepared up to this point 2 hours ahead and kept at room temperature, covered.
• Pour milk evenly over potatoes and bake 35 minutes, or until potatoes are tender and top is golden. Gratin may be made 1 day ahead and chilled, covered. Reheat gratin before serving.

SWEET ONION POTATOES AU GRATIN

Steps:

• Heat a small skillet with the butter over medium heat. Add the onions, season with salt ground thyme, bay leaf and cook until very soft and sweet and lightly caramelized, 20 minutes. Season with salt and pepper, to taste, and discard the bay leaf.
• While the onions cook, put the potatoes in a medium pot and cover with water. Bring to a boil, then salt the water and cook to tender, 12 to 15 minutes. Drain and return the potatoes to the hot pot. Mash the potatoes with the cream and Parmesan and season with salt and pepper, to taste.
• Preheat the broiler.
• Arrange the mashed potatoes in individual gratin dishes or 1 shallow casserole. Top the potatoes with the onions and Gruyere cheese. Put them on a sheet pan and brown under a hot broiler until bubbly, about 2 minutes. Remove from the oven and serve hot.

YUKON GOLD POTATO GRATIN WITH HORSERADISH, GRUYERE AND SWEET ONION

Steps:

• Preheat the oven to 375 degrees F.
• Put the cream, half-and-half, horseradish, nutmeg, garlic and onion in a medium saucepan and slowly bring the mixture to a simmer. Be sure to stir on occasion to prevent scorching. Season with salt and pepper.
• In a 9-by-13-inch baking dish, spoon a thin layer of the cream and onion mixture onto the bottom. Layer the potatoes, followed by a sprinkle of cheese. Season lightly with salt and pepper. Repeat this process until the dish is filled and the gratin is moist. Combine the breadcrumbs and thyme and sprinkle on top.
• Bake until the potatoes are tender and the gratin is caramelized on top and bubbly on the edges, 45 minutes to 1 hour. Allow to cool slightly before serving.

APPLE, POTATO AND ONION GRATIN

Steps:

• preheat oven to 400 degrees. butter a 13x9 pyrex.
• melt 6 T butter in a large nonstick skillet over medium heat. add onion, thyme and 2 t salt; saute until onion are translucent, about 10 minutes.
• increase heat to medium-high; saute until onion are tender and begin to color, about 8 minutes longer. remove from heat. add remaining 6 T butter, 2/3 c water, wine, and sugar to skillet; stir and swirl skillet to combine. bring to a boil, then cool onion mixture to lukewarm.
• combine potatoes, apples, remaining 2 t salt and onion mixture in large bowl; toss gently to blend.
• transfer to prepared baking dish, spreading evenly. cover dish with parchment paper, then cover with foil, shiny side down.
• bake gratin until potatoes are tender, about 55 minutes. uncover and bake until top browns and juices bubble thickly, about 20 minutes longer.
• (can be made 6 hours ahead. let stand uncovered at room temperature. rewarm, loosely covered with foil, in 300 degree oven for 20 minutes.) let gratin stand 15 minutes before serving.

FOUR-ONION GRATIN

Steps:

• Melt butter in heavy large skillet over medium heat. Add leeks, large onions, shallots and garlic and sauté until all are tender, about 20 minutes. Add baby onions and cook 10 minutes longer, stirring occasionally. Mix in 2 cups whipping cream. Boil until cream is thickened to sauce consistency, about 10 minutes. Transfer vegetable-cream mixture to 6-cup shallow baking dish. (Can be prepared 1 day ahead. Cover and refrigerate. Return mixture to room temperature before continuing.)
• Preheat oven to 425°F Sprinkle breadcrumbs over onion mixture. Bake until breadcrumbs are golden brown and onion mixture bubbles, about 20 minutes. Sprinkle with parsley.

POTATO, ONION AND TOMATO GRATIN

Steps:

• Preheat oven to 400 degrees
• Generously oil the gratin dish. Make a layer of potatoes, a layer of onions and a layer of tomatoes in the baking dish, sprinkling each layer with a little of the salt and pepper and drizzling each layer with 1/2 tablespoon of the olive oil. Repeat with another layer of potatoes, onions and tomatoes, again sprinkling each with a little of the salt and pepper and drizzling each with 1/2 tablespoon of the olive oil.
• Combine the Pecorino Romano, bread crumbs and oregano in a bowl.
• Bake in the preheated oven for about an hour or until the potatoes are tender when pierced with a knife. After 50 minutes of cooking, top with the Pecorino Romano, bread crumbs and oregano and the remaining 5 tablespoons of olive oil. Continue cooking until the potatoes are cooked and the bread crumbs are brown and crispy. Serve immediately.
• Prepare ahead...Cook the gratin up to 1 day ahead but to not add the bread crumbs, cheese and oregano. Allow to cool and store in the refrigerator, covered tightly. When ready to serve, remove the gratin from the refrigerator up to 2 hours ahead. Preheat oven to 400. Mix bread crumbs, cheese and oregano and spread evenly on top of the gratin. Spoon over the remaining olive oil and bake in the oven and back in the oven for about 20 minutes, until the topping is brown and crispy. Serve immidiately.