Caramelized Onion and Gruyère Potato Galette

This caramelized onion and Gruyère potato galette looks like a French bakery masterpiece, but it comes together in a single cast-iron skillet. Paper-thin Yukon Gold slices are shingled over a layer of sweet balsamic onions and nutty Gruyère, then baked until the top turns crisp like a potato chip.

The result is a stunning, golden tart that slices with a satisfying crunch and tastes like a warm bistro favorite. Perfect as a side dish or a vegetarian centerpiece.

Potato galette is the kind of dish that feels both rustic and elegant. Thinly sliced potatoes are layered over caramelized onions and cheese, then baked until the edges turn lacy and crisp. The secret is the method: a hot oven, a heavy skillet, and patience.

The onions melt into a sweet, jammy base, while the Gruyère forms a golden crust on the bottom. Each bite delivers a contrast of textures — crispy shingles on top, tender potatoes below, and a rich, savory layer that ties it all together. Serve it straight from the skillet or flipped onto a platter for a dramatic presentation.

Ingredients

Why this recipe works

The combination of caramelized onions and Gruyère is a classic French pairing. The onions are cooked slowly until their natural sugars deepen into a dark, sweet jam, while the Gruyère brings a nutty, salty richness. The balsamic vinegar adds a subtle tang that cuts through the richness and brightens the whole dish. The potatoes absorb all these flavors as they bake, becoming both tender and intensely savory.

Baking the galette in a cast-iron skillet is essential. The heavy pan distributes heat evenly, allowing the bottom to crisp and brown while the top shingles turn golden.

The parchment paper ensures clean release, and the inversion step reveals the caramelized onion and cheese layer, which becomes a glossy, sticky crust. This method gives you a dish that looks like it took hours, but the hands-on time is minimal.

Notes and substitutions

Yukon Gold potatoes are ideal for this recipe because they hold their shape when sliced thin and have a buttery, medium-starch texture. They don't turn mushy like russets, and they brown beautifully. If you can't find Yukon Gold, use another waxy potato like red potatoes or fingerlings. The mandoline is your best friend here — it ensures uniform slices that cook evenly and look gorgeous when shingled.

Gruyère is a Swiss cheese with a nutty, slightly sweet flavor that melts exceptionally well. It's the traditional choice for French onion soup and gratins. If you prefer a sharper flavor, substitute with aged cheddar or Emmental.

The caramelized onions can be made ahead and kept in the fridge for up to 3 days, which makes assembly even quicker. Use a good-quality balsamic vinegar — it makes a difference in the depth of flavor.

• Gruyère: Swiss cheese, Emmental, or sharp white cheddar for a similar nutty melt.
• Yukon Gold potatoes: Russet potatoes, but expect a slightly drier texture; reduce the butter by half.
• Balsamic vinegar: Sherry vinegar or red wine vinegar with a pinch of sugar.
• Fresh thyme: 1 tsp dried thyme, added to the butter before brushing.

Equipment

• 9-inch cast-iron skillet
• Mandoline slicer
• Parchment paper
• Pastry brush
• Chef's knife
• Cutting board
• Mixing bowl
• Spatula