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French Onion Mushroom Tart

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Experience the delightful fusion of flavors in this French Onion Mushroom Tart, a savory masterpiece sure to impress at any gathering. Nestled in a flaky puff pastry, the combination of sweet caramelized onions and earthy mushrooms creates a rich and satisfying dish that is versatile enough for any occasion. Whether served as an elegant appetizer or a hearty main course, this tart pairs beautifully with fresh salads or roasted vegetables. With straightforward preparation steps, even novice cooks can master this impressive recipe. Customize it with your favorite cheeses and herbs for a personal touch. Indulge in this comforting tart that brings warmth and gourmet flair to your table.

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 mushrooms work well)
  • 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. Caramelize onions: In a large skillet, heat butter and olive oil over medium-low heat. Add sliced onions and cook for about 30 minutes until golden brown, stirring occasionally. Add sugar, salt, and pepper halfway through cooking.
  2. Sauté mushrooms: In the same skillet, add sliced mushrooms and sauté until golden brown (about 10 minutes). Stir in thyme if using.
  3. Prepare puff pastry: Preheat oven to 400°F (200°C). Roll out puff pastry into a rectangle on a floured surface and place it on a parchment-lined baking sheet. Score a 1-inch border around the edges.
  4. Assemble tart: Spread caramelized onions over the pastry within the scored border. Top with sautéed mushrooms and sprinkle with Gruyère and Parmesan cheese. Brush edges with beaten egg.
  5. Bake: Bake for 20–25 minutes until golden brown and cheese is bubbly. Cool slightly before slicing.

Nutrition

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