French Onion and Mushroom Tart

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The French Onion Mushroom Tart is a savory masterpiece with rich caramelized onions and earthy mushrooms nestled on a flaky, buttery puff pastry. The addition of Gruyère cheese melts beautifully over the vegetables, creating a decadent layer of creamy goodness that perfectly complements the crispy edges of the tart.

Ingredients:

For the tart:

  • 1 sheet puff pastry (store-bought or homemade)
  • 2 tablespoons olive oil
  • 2 medium onions, thinly sliced
  • 2 cups mushrooms, sliced (cremini or button mushrooms work well)
  • 1/2 cup heavy cream
  • 1/2 cup grated Gruyère cheese (or Swiss cheese)
  • 1/2 teaspoon thyme (fresh or dried)
  • Salt and pepper, to taste

For the egg wash:

  • 1 egg, beaten
  • 1 tablespoon water

Directions:

  1. Preheat the oven: Preheat your oven to 375°F (190°C).
  2. Cook the onions and mushrooms: In a large skillet, heat olive oil over medium heat. Add the onions and cook, stirring occasionally, for 15-20 minutes, until they are caramelized and golden brown. Add the mushrooms and cook for another 5-7 minutes, until softened. Season with salt, pepper, and thyme. Remove from heat and let cool slightly.
  3. Prepare the pastry: Roll out the puff pastry sheet on a lightly floured surface. Carefully transfer it to a tart pan or baking sheet and press it into the edges to fit. Trim off any excess dough.
  4. Assemble the tart: Spread the caramelized onion and mushroom mixture evenly over the pastry. Drizzle the heavy cream over the vegetables and sprinkle with grated Gruyère cheese.
  5. Egg wash: Brush the edges of the pastry with the beaten egg and water mixture for a golden finish.
  6. Bake the tart: Place the tart in the oven and bake for 25-30 minutes, or until the pastry is golden and the cheese is melted and bubbly.
  7. Let the tart cool slightly before slicing and serving. Garnish with additional thyme, if desired.

Prep Time: 15 minutes | Cooking Time: 30 minutes | Total Time: 45 minutes
Kcal: 250 kcal | Servings: 6 servings

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