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French Onion Mushroom Tart


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3.9 from 36 reviews

  • Author: stella
  • Total Time: 65 minutes
  • Yield: 6 servings 1x
  • Diet: Vegetarian

Description

A delightful dish combining caramelized onions, earthy mushrooms, and creamy Gruyère cheese in a buttery pie crust.


Ingredients

Scale
  • 1 pie crust
  • 2 large onions, thinly sliced
  • 8 oz mushrooms, sliced
  • 2 tbsp olive oil
  • 1 tsp fresh thyme or 1/2 tsp dried thyme
  • 1 cup grated Gruyère cheese
  • 1 cup sour cream
  • 2 eggs
  • Salt to taste
  • Pepper to taste

Instructions

  1. Preheat your oven to 375°F (190°C).
  2. In a large skillet, heat the olive oil over medium heat. Add the sliced onions and cook until caramelized and soft, about 20 minutes.
  3. Add the sliced mushrooms and thyme to the pan. Cook until the mushrooms are browned and tender. Season with salt and pepper.
  4. In a mixing bowl, combine the sour cream, eggs, and half of the grated Gruyère cheese. Whisk until smooth.
  5. Spread the caramelized onion and mushroom mixture over the pie crust. Pour the sour cream mixture on top and sprinkle with remaining Gruyère cheese.
  6. Bake for 30-35 minutes, or until golden brown and set.
  7. Allow to cool for a few minutes before slicing.

Notes

For a richer flavor, add balsamic vinegar to the onions. Store leftovers in an airtight container for up to 3 days.

  • Prep Time: 15 minutes
  • Cook Time: 50 minutes
  • Category: Appetizer
  • Method: Baking
  • Cuisine: French

Nutrition

  • Serving Size: 1 slice
  • Calories: 320
  • Sugar: 2g
  • Sodium: 450mg
  • Fat: 22g
  • Saturated Fat: 10g
  • Unsaturated Fat: 12g
  • Trans Fat: 0g
  • Carbohydrates: 22g
  • Fiber: 1g
  • Protein: 10g
  • Cholesterol: 60mg