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French Onion Galette

1 galette
Course Appetizer, Main Course, Side Dish
Cuisine American
Keyword pie
Total Time 1 hour 30 minutes
Servings 6
Author Cherry on My Sundae


Pie dough

  • 1 ¼ cups all-purpose flour
  • ¼ teaspoon salt
  • ¼ cup parmesan grated
  • ½ cup cold butter cut into small chunks
  • 3-4 tablespoon ice cold water


  • 3 onions thinly sliced
  • 1 teaspoon salt
  • ½ teaspoon garlic powder
  • ½ teaspoon black pepper
  • 1 teaspoon fresh thyme
  • ¼ cup sour cream
  • ½ cup gruyere grated
  • ¼ cup heavy cream
  • 2 tablespoon parmesan grated


  • Preheat oven to 425 degrees F.
  • Make the pie dough. Combine 1 ¼ cup all-purpose flour with ¼ tsp, ¼ cup grated parmesan, and ½ cup cold butter. Use a food processor, pastry blender, or your hands to mix until well combined. The mixture should resemble coarse sand. Add 3-4 tablespoon ice-cold water, mixing just until the dough comes together. Shape into a disc and wrap in plastic wrap. Chill in the fridge for 30 minutes.
  • Meanwhile, make the filling. Heat 1 tablespoon oil in a large saute pan over medium heat. Add sliced onion and season with 1 teaspoon salt. Saute until softened, about 10 minutes. Reduce heat to medium-low and continue to cook until caramelized, about 45 minutes. Remove from heat and let cool.
  • Combine the caramelized onions with ½ teaspoon garlic powder, ½ teaspoon black pepper, 1 teaspoon fresh thyme, ¼ cup sour cream, and ½ cup gruyere, stirring until well combined.
  • Dust a clean work counter with flour. Roll out the pie dough into a large circle, about ¼ inch thick. Spread the onion filling in the center, leaving a 1-inch border. Fold over the edges to create a crust.
  • Brush the edges with heavy cream and sprinkle grated parmesan on top. Bake for 20-25 minutes or until golden brown. Let cool for 10 minutes. Serve warm.