
Few dishes are as quietly showstopping as this classic French potato cake, where humble Yukon Golds are transformed into something genuinely elegant. The technique is all about patience and layering — thin slices arranged in overlapping circles, brushed with clarified butter and scattered with fresh thyme at every level, so every single bite is rich and fragrant. Clarifying the butter is a small extra step that makes a real difference, removing the milk solids so the layers crisp and caramelize without burning during that long, hot oven bake. Pressing the cake down twice — once on the stovetop and once mid-bake — is what gives it that dense, cohesive structure that holds together beautifully when you flip it onto a plate. The golden, lacquered crust that emerges from the pan is genuinely one of the most satisfying things you can put on a dinner table. Since the entire recipe relies on potatoes, butter, thyme, salt, and a little parsley, there is absolutely nothing to second-guess here — no sweeteners, no hidden additives, just clean and straightforward ingredients. Serve it in wedges straight away while the edges are still crisp.
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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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