Prep Time 25 minutes mins
Cook Time 30 minutes mins
Resting Time 1 hour hr
Total Time 1 hour hr 55 minutes mins
For the most vibrant color and tender crumb, use room-temperature eggs and buttermilk and avoid overmixing after combining wet and dry ingredients. Natural cocoa gives the classic tang and hue, but if using Dutch-process, add an extra 1/4 teaspoon vinegar to balance. If your batter seems thick, a tablespoon or two of buttermilk will loosen it; if thin, let it rest 5 minutes to hydrate the flour. Chill the frosted cake for 20–30 minutes before slicing for cleaner cuts, and use mini chips to keep the frosting spreadable. Cakes can be baked a day ahead, wrapped well, and chilled; frosting keeps refrigerated up to 5 days—rewhip briefly before using.