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French Onion Galette

A crispy, savory galette filled with sweet caramelized onions and melting Gruyère cheese, perfect for any occasion.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 4 servings
Course: Dinner, Main Course
Cuisine: French
Calories: 300
Ingredients Method Notes

Ingredients
  

For the filling
  • 2 large onions, thinly sliced
  • 2 tablespoons olive oil
  • 1 teaspoon sugar
  • to taste salt and pepper
  • 1 sheet puff pastry or pie dough Ensure it is thawed if frozen
  • 1 cup Gruyère cheese, shredded Can substitute with Swiss cheese or mozzarella
  • 1 tablespoon fresh thyme or 1 teaspoon dried thyme
  • 1 egg beaten (for egg wash)

Method
 

Caramelizing the Onions
  1. In a large skillet, heat 2 tablespoons of olive oil over medium heat. Add the thinly sliced onions, sprinkle with salt, pepper, and sugar. Stir frequently for about 20-25 minutes until the onions are golden and caramelized.
Preparing the Pastry
  1. While the onions cook, preheat your oven to 400°F (200°C).
  2. Roll out your puff pastry onto a baking sheet lined with parchment paper. Create a slight border around the edges, leaving the center free for filling.
  3. Once the onions are ready, sprinkle half of the Gruyère cheese in the center of the pastry sheet. Pile the caramelized onions on top, then add the remaining cheese and the thyme.
  4. Gently fold the edges of the pastry over the filling, creating pleats. Brush the edges with the beaten egg for a golden finish.
Baking
  1. Bake in the preheated oven for 25-30 minutes or until the pastry is golden brown.
Serving
  1. Once baked, allow it to cool for a few minutes before slicing and serving. Enjoy your homemade French Onion Galette!

Notes

For perfectly caramelized onions, be patient! Avoid overcrowding the pan to ensure even cooking. Refrigerate leftovers for up to 3 days, or freeze before baking for up to 2 months. Reheat in the oven at 350°F (175°C) for about 10 minutes.