Steps:
- Preheat an oven to 350°F. Line a baking sheet with parchment paper. On a floured surface, roll out the puff pastry into a rectangle about 15 by 10 inches and 1/8 inch thick. Cut the pastry into six 5-inch squares. Transfer to the prepared baking sheet and refrigerate until ready to use. In a large pot over medium heat, melt 2 Tbs. of the butter. Add the mushrooms and shallots and cook, stirring, for 1 minute. Reduce the heat to low, cover and cook until the mushrooms are soft, 5 to 7 minutes. Uncover, increase the heat to medium-high and cook, stirring, until the liquid evaporates, 3 to 5 minutes more. Stir in the 1 tsp. salt and the 1/8 tsp. pepper. Transfer the mushrooms to a food processor and pulse until finely chopped. Set aside. In the same pot over medium-low heat, melt the remaining 3 Tbs. butter. Sprinkle in the flour and stir until no lumps are visible. Slowly whisk in the 2 cups milk until combined. Cook, stirring with a wooden spoon, until the mixture is bubbling vigorously and thickened. While stirring, slowly add the stock. Bring to a gentle simmer and cook, stirring, for 3 minutes more. The mixture should be opaque and beige in color. Stir in the mushroom puree. Season with salt and pepper and thin with additional milk, if needed. Ladle the soup into 6 ovenproof bowls and place on a baking sheet. Brush the tops of the puff pastry squares with the beaten egg. Place 1 square on top of each bowl and press the edges to adhere. Bake until the pastry is puffed and golden, 15 to 20 minutes. Serve immediately.
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