Savory Mushroom Onion Galette (Printable View)
Flaky pastry encasing caramelized onions, mushrooms, and Gruyère for a satisfying, savory dish.
# Ingredient List:
→ Pastry
01 - 1 1/4 cups all-purpose flour
02 - 1/2 cup unsalted butter, cold and cubed
03 - 1/4 teaspoon salt
04 - 1/4 cup ice water
→ Filling
05 - 2 tablespoons olive oil
06 - 1 tablespoon unsalted butter
07 - 1 large yellow onion, thinly sliced
08 - 2 cloves garlic, minced
09 - 12 ounces cremini or button mushrooms, sliced
10 - 1 teaspoon fresh thyme leaves or 1/2 teaspoon dried thyme
11 - 1/2 teaspoon salt
12 - 1/4 teaspoon black pepper
13 - 1/4 cup grated Gruyère or Swiss cheese
14 - 1 tablespoon chopped fresh parsley, optional
→ Egg Wash
15 - 1 egg beaten with 1 tablespoon water
# How to Make It:
01 - In a large bowl, whisk together flour and salt. Add cold butter and cut in using a pastry cutter or fingertips until mixture resembles coarse crumbs. Gradually add ice water until the dough just comes together. Shape into a disk, wrap, and chill for at least 30 minutes.
02 - Heat olive oil and butter in a large skillet over medium heat. Add onions and cook, stirring frequently, until they are soft and golden, about 12 minutes. Stir in garlic and cook for 1 minute. Add mushrooms, thyme, salt, and pepper; cook until mushrooms are tender and moisture evaporates, about 8 to 10 minutes. Remove from heat and let cool slightly.
03 - Preheat oven to 400°F and line a baking sheet with parchment paper.
04 - On a lightly floured surface, roll chilled dough into a 12-inch circle. Transfer the dough to the prepared baking sheet.
05 - Spread the mushroom and onion filling over the center of the dough, leaving a 2-inch border. Sprinkle with Gruyère cheese and parsley if desired.
06 - Fold the pastry edges over the filling, pleating as needed to form a rustic border, leaving the center exposed. Brush the crust with the egg wash.
07 - Bake for 30 to 35 minutes until the crust is golden and crisp. Allow to cool for 5 minutes before slicing and serving.
# Expert Suggestions:
01 -
- The balance of earthy mushrooms and sweet onions feels like a perfectly kept kitchen secret.
- Its rustic charm makes you feel like you've just stepped into a cozy French bistro right at home.
02 -
- Chilling the dough properly is non-negotiable for that perfect flakiness.
- Slow caramelization of onions is what turns this dish from good to unforgettable.
03 -
- Using a combination of butter and olive oil in the filling adds depth and balances richness perfectly.
- Let the galette rest a few minutes after baking; the filling sets and slices cleaner.