Mile-High Chocolate Cake

Three layers of tender, deeply chocolatey cake stacked tall and covered in a silky cocoa icing that’s part buttercream, part ganache.

The batter starts with a smart technique: cocoa powder blooms in hot water with baking soda, then sits while you mix everything else. That resting step dissolves the cocoa fully, intensifies the chocolate flavor, and activates the leavening so the cake rises with a fine, even crumb. Buttermilk adds tang and tenderness, reacting with the baking soda for extra lift.

The frosting deserves attention too. Melted butter and unsweetened chocolate get cooled, then beaten into sifted powdered sugar with an egg white, vanilla, and a touch of lemon juice. That lemon cuts the sweetness just enough so the icing doesn’t taste like pure sugar. Add milk gradually until it’s spreadable.

Pro Tips

• Line the pans with wax paper AND grease them. Three-layer cakes are devastating to lose to a stuck pan.
• Cool in pans for exactly 10 minutes, then turn out. Too long and steam makes the cakes stick; too soon and they break.
• Let the chocolate mixture in the icing cool to room temperature before adding to the sugar. Warm chocolate will melt the powdered sugar into a runny mess.

Variations

• Fill between layers with raspberry jam before frosting for a chocolate-raspberry cake.
• Add a teaspoon of espresso powder to the cocoa mixture for a mocha-depth flavor boost.
• Use this same batter in a 9×13 sheet pan (bake 30 to 35 minutes) for a simpler weeknight version.