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French Onion Mushroom Tart

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Indulge in the rich flavors of our French Onion Mushroom Tart, a gourmet dish that’s perfect for any occasion. This savory tart features a flaky puff pastry base filled with sweet caramelized onions and earthy mushrooms, topped with melted Gruyère and Parmesan cheese. Whether served as an appetizer at your next gathering or as a light dinner option, this recipe is both easy to prepare and sure to impress. With its golden-brown crust and delightful aromas wafting through your kitchen, this tart is a comforting addition to any meal.

Ingredients

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  • 1 sheet puff pastry, thawed
  • 2 large onions, thinly sliced
  • 1 1/2 cups mushrooms, sliced (cremini, shiitake, or button)
  • 2 tablespoons unsalted butter
  • 1 tablespoon olive oil
  • 1 teaspoon sugar
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/2 teaspoon fresh thyme leaves (optional)
  • 1/2 cup Gruyère cheese, grated
  • 1/4 cup Parmesan cheese, grated
  • 1 egg, beaten (for egg wash)

Instructions

  1. In a large skillet over medium-low heat, melt butter and olive oil. Add onions and cook for about 30 minutes until caramelized. Stir in sugar, salt, and pepper halfway through.
  2. In the same skillet, sauté sliced mushrooms over medium heat until golden brown and liquid evaporates—about 10 minutes.
  3. Preheat your oven to 400°F (200°C). Roll out puff pastry on a floured surface to fit your baking sheet. Place on a parchment-lined sheet and score a border around the edges.
  4. Spread caramelized onions over the pastry base, top with sautéed mushrooms, and sprinkle cheeses on top. Brush edges with beaten egg.
  5. Bake for 20-25 minutes until golden brown and cheese is melted.

Nutrition

Find it online: https://myrecipestories.com/french-onion-mushroom-tart/