
Few dishes are as quietly showstopping as this classic French potato cake, and the good news is that every single ingredient here is completely straightforward. Yukon Golds are sliced thin, layered with clarified butter, thyme, and salt, then pressed and baked until the whole thing becomes a crispy, golden, meltingly tender cake that unmolds like a dream. There are no hidden additives, no stabilizers, and absolutely nothing derived from animal collagen — just potatoes, butter, and herbs doing exactly what they were meant to do. The technique of clarifying the butter is what gives this dish its signature richness and that deeply golden crust, and it's easier than it sounds — you're simply skimming off the foam and leaving the pure fat behind. Keeping the starch on the potato slices is the other secret: it acts as a natural binder so the layers hold together when you flip the pan. That confident inversion at the end is genuinely satisfying, revealing a caramelized, lacquered top that looks like it came out of a Parisian bistro kitchen. A scatter of fresh parsley is all it needs to finish.
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Preheat the oven to 425°F (220°C). Melt the butter in a small saucepan over low heat, then let it sit undisturbed for 2 minutes. Skim the white foam from the surface and carefully pour the clear golden liquid into a small bowl, leaving the milky solids behind — you should have about 4 tbsp clarified butter.
Using a mandoline or a sharp knife, slice the peeled potatoes into rounds approximately 1/8-inch (3mm) thick. Do not rinse or soak the slices — the surface starch helps the layers bind.
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