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French Onion Mushroom Tart

French Onion Mushroom Tart
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Indulge in the delightful flavors of a French Onion Mushroom Tart, a perfect blend of sweet caramelized onions and savory sautéed mushrooms enveloped in a flaky puff pastry. This elegant dish is ideal for gatherings as an appetizer or can be enjoyed as a satisfying light meal. With its rich taste and impressive presentation, this tart appeals to both novice and experienced cooks. Customize it by adding your favorite herbs or vegetables to create your own unique version. Whether served warm or at room temperature, this tart is sure to impress at any occasion.

Ingredients

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  • 1 sheet puff pastry, thawed
  • 2 large onions, thinly sliced
  • 1 1/2 cups mushrooms (cremini, shiitake, or button), sliced
  • 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 the onions: In a skillet, heat butter and olive oil over medium-low heat. Add sliced onions and cook for 30 minutes until golden brown, stirring occasionally. Add sugar, salt, and pepper halfway through.
  2. Sauté the mushrooms: Increase heat to medium and add sliced mushrooms to the skillet. Cook until golden brown and all liquid evaporates (about 10 minutes). Stir in thyme if using.
  3. Prepare the 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 without cutting through.
  4. Assemble the tart: Spread caramelized onions over the pastry, top with sautéed mushrooms, and sprinkle cheeses on top. Brush edges with beaten egg.
  5. Bake: Place in preheated oven for 20-25 minutes until golden brown and puffed up. Allow to cool slightly before slicing.

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

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