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French Onion Mushroom Tart

Savory French Onion Mushroom Tart for Effortless Elegance

This French Onion Mushroom Tart combines caramelized onions and sautéed mushrooms in a flaky crust, making it a must-try appetizer for any gathering.
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Prep Time 15 minutes
Cook Time 35 minutes
Cooling Time 5 minutes
Total Time 55 minutes
Servings: 8 slices
Course: Appetizers
Cuisine: French
Calories: 250
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Tart Base
  • 1 sheet Puff Pastry store-bought or homemade
For the Filling
  • 2 large Onions (Caramelized)
  • 1/4 cup Sherry or dry white wine
  • 8 oz Mushrooms (Sautéed) shiitake and cremini recommended
  • 2 cloves Garlic minced
  • 1 tablespoon Thyme fresh recommended
  • 1 cup Gruyère Cheese grated
Optional Garnish
  • 2 tablespoons Fresh Herbs chopped parsley or chives

Equipment

  • large skillet
  • Baking sheet
  • Parchment paper
  • Rolling Pin

Method
 

Preparation Steps
  1. Caramelize the onions by slicing them thinly and cooking in a skillet over medium heat with olive oil for about 30 minutes until golden.
  2. Add sherry and let it evaporate to enhance the onion's flavor.
  3. In the same skillet, add minced garlic and thyme, then stir and add sliced mushrooms. Sauté for 8-10 minutes until tender.
  4. Prepare the puff pastry by thawing it and rolling it out on a floured surface, then transfer to a baking sheet lined with parchment paper.
  5. Spread the caramelized onion and mushroom mixture over the pastry, leaving a border, and sprinkle with Gruyère cheese.
  6. Bake in a preheated oven at 375°F for about 25-30 minutes until golden brown and cheese is bubbling.
  7. Let cool for 5 minutes, slice, and serve warm garnished with fresh herbs.

Nutrition

Serving: 1sliceCalories: 250kcalCarbohydrates: 20gProtein: 6gFat: 18gSaturated Fat: 10gPolyunsaturated Fat: 2gMonounsaturated Fat: 4gCholesterol: 30mgSodium: 350mgPotassium: 200mgFiber: 1gSugar: 3gVitamin A: 500IUVitamin C: 5mgCalcium: 150mgIron: 1mg

Notes

Use high-quality ingredients for the best flavor. Prepare filling in advance for improved taste.

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