This French onion galette is elegant yet simple. A flaky Gruyère and thyme crust holds sweet, caramelized onions, baked until golden and comforting. Serve warm with a green salad for a complete, satisfying meal.
Here’s a special, easy dish you can make for a celebratory dinner or a cozy night in.
This galette feels fancy but is straightforward to prepare. The caramelized onions nestle into a savory Gruyère-thyme crust that browns into a crisp, buttery finish. A final sprinkle of Parmesan and a short rest make serving easy — each slice stays intact and melts in your mouth.
If you want an alternative to a traditional holiday spread or a break from routine dinner dishes, this galette is a lovely choice. Paired with a big green salad and a simple dessert, it becomes an impressive meal with minimal fuss.
It’s approachable to make, beloved by most guests (and great as leftovers), and a wonderful way to treat yourself or others to a thoughtful home-cooked plate.
I love galettes because they’re easier and more forgiving than a traditional pie. Their rustic shape is part of the charm, and they can be sweet or savory. In cooler months, savory galettes are especially comforting — this one is a favorite for that cozy, elevated feeling.
Let’s get into it!
The crust is a highlight: Gruyère and thyme folded into a buttery dough creates layers of flakiness and savory depth that echo the flavors of French onion soup. The dough is simple to make and can be chilled ahead; if you’re short on time, 30 minutes in the fridge is enough.
For the onions, aim for a light to medium caramelization on the stovetop. I caramelize them for about an hour but stop before they turn too dark, since they’ll continue to bake inside the galette. A gentle golden color before baking yields deep, rich flavor without bitterness.
The assembly is simple: roll the dough into a rustic circle, sprinkle with extra Gruyère, add the caramelized onions, fold the edges up, brush with egg wash, and sprinkle Parmesan. Bake until the crust is golden and the cheese is bubbly.
Your kitchen will smell irresistibly savory as it bakes. Let the galette rest 15–20 minutes after removing it from the oven so it sets for clean slices. Finish with a little grated Parmesan and a scattering of thyme if you like.
This is a warming, elegant main that isn’t soup or pasta — it feels indulgent while still being homey. It’s perfect for a special occasion or when you want dinner to feel like a treat.
French Onion Galette
French Onion Galette
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Ingredients
Filling
- 6 tablespoons unsalted butter
- 4 large sweet or yellow onions, thinly sliced
- Kosher salt, to taste
- 2 garlic cloves, minced
- 1/4 teaspoon dried thyme
- 4 ounces freshly grated Gruyère (for filling)
- Parmesan, for serving
Crust
- 2 cups sifted all-purpose flour
- 1 teaspoon sugar
- 1 teaspoon salt
- 1/2 teaspoon dried thyme
- 1 large egg, lightly beaten
- 1/2 teaspoon white vinegar
- 1/4 cup ice cold water
- 3/4 cup cold unsalted butter, cut into pieces
- 4 ounces freshly grated Gruyère (for crust)
- 1 large egg + 1 teaspoon water, beaten (egg wash)
Instructions
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Heat the butter in a large skillet over medium heat. Add the sliced onions and a generous pinch of salt. Cook, stirring often, until the onions begin to soften, about 10 to 15 minutes. Reduce heat to low and continue cooking, stirring frequently, until the onions are golden and caramelized, about 45 to 60 minutes. Avoid letting them get too dark since they will bake further in the oven. While the onions cook, prepare the crust.
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In a food processor, pulse together the flour, sugar, salt and thyme. In a small bowl, whisk the egg, vinegar and cold water. Add the cold butter pieces and the grated Gruyère to the processor and pulse until the mixture forms small, coarse crumbs. Sprinkle the egg-water mixture over the flour mixture and pulse until the dough just comes together.
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Gather the dough, wrap it in plastic wrap, and refrigerate for at least 30 minutes.
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Preheat the oven to 400°F (200°C).
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Roll the chilled dough into a rustic circle about 1/4 inch thick and transfer it to a parchment-lined baking sheet. Sprinkle the crust with the remaining 4 ounces of Gruyère, leaving a 2-inch border. Sprinkle a little dried thyme, then pile on the caramelized onions. Fold the edges of the dough up around the filling and brush the crust with the beaten egg wash.
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Bake until the crust is golden and the cheese is bubbling, about 40 to 45 minutes. Remove from the oven, let cool slightly so it sets, then finish with a sprinkle of Parmesan and fresh thyme if desired. Serve warm.
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That caramelized onion flavor is pure comfort — rich, sweet, and deeply satisfying.