Caramelized Onion and Mushroom Galette

Get ready to embark on a culinary adventure with our Caramelized Onion and Mushroom Galette! This savory delight brings together the rich sweetness of caramelized onions, the earthy aroma of sautéed mushrooms, and a buttery crust that will melt in your mouth. It’s the perfect dish to impress your guests or savor on a cozy night in.
5 from 1 vote

Prep Time 15 minutes
Cook Time 45 minutes
Total Time 1 hour
Course Vegetarian Recipes
Cuisine French
Servings 4 servings
Calories 420 kcal


  • 1 store-bought pie crust
  • 2 large onions, thinly sliced
  • 2 cups mushrooms, sliced
  • 2 tablespoons butter
  • 2 tablespoons olive oil
  • 1 teaspoon thyme leaves
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/4 cup grated Gruyere cheese
  • 1 tablespoon balsamic vinegar
  • 1 egg, beaten (for egg wash)


  • Preheat the oven to 400°F (200°C).
  • Roll out the pie crust on a floured surface and transfer it to a baking sheet lined with parchment paper.
  • In a large skillet, melt the butter with the olive oil over medium heat. Add the sliced onions and cook until they start to caramelize, stirring occasionally for about 20 minutes.
  • Add the mushrooms to the skillet and continue cooking for another 5 minutes until they are softened.
  • Stir in the thyme leaves, salt, and black pepper. Cook for an additional 2 minutes.
  • Remove the skillet from the heat and stir in the balsamic vinegar. Allow the mixture to cool slightly.
  • Spread the caramelized onion and mushroom mixture evenly onto the rolled-out pie crust, leaving a border around the edges.
  • Sprinkle the grated Gruyere cheese over the top of the filling.
  • Fold the edges of the pie crust over the filling, pleating as you go.
  • Brush the exposed edges of the crust with the beaten egg wash.
  • Bake the galette in the preheated oven for 25-30 minutes, or until the crust is golden brown.
  • Remove from the oven and let it cool for a few minutes before serving.
  • Slice and serve the galette warm or at room temperature.

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