This Classic French Butter Cake (Gâteau Breton) is rich, dense, and deeply buttery, with a golden crust and tender crumb. An elegant French dessert perfect for any occasion.
1 cup (2 sticks) salted butter, softened
1 cup granulated sugar
6 large egg yolks (1 reserved for glaze)
2 cups all-purpose flour
1 tsp vanilla extract (optional)
1 tsp water or milk (for glaze)
Preheat oven to 350°F. Line and butter a 9-inch pan.
Cream butter and sugar until fluffy. Beat in 5 yolks one at a time.
Mix in vanilla and flour until a soft dough forms.
Press dough into pan. Brush with remaining yolk mixed with water.
Score top with crosshatch pattern.
Bake 35–40 minutes until golden. Cool before slicing.
Use high-quality butter for best flavor. Store covered at room temp up to 5 days. Let rest overnight for deeper flavor.