Chocolate Peppermint Cake

Three things make this chocolate cake stand apart. Brown sugar instead of granulated gives the crumb a molasses depth you don’t get from a standard devil’s food. Boiling water stirred in at the end turns the batter loose and produces a supremely tender cake. And thin chocolate mint wafers, pressed between still-warm layers, melt into a silky surprise filling.

Buttermilk and baking soda are the leavening duo. The acid and base react on contact, which is why beating just until smooth (no longer) is the instruction, overmixing collapses the lift.

The frosting is classic seven-minute icing, whipped over a double boiler until it stands up in glossy peaks. Peppermint extract goes in at the very end so the volatile oils don’t cook off and fade.

Pro Tips

• Cool the melted unsweetened chocolate before adding to the butter and sugar. Hot chocolate will scramble the eggs and break the batter.
• Press the mint wafers onto the still-warm bottom two layers the moment they come out of the pans. They’ll soften and adhere without needing to be melted separately.
• Beat the frosting a full 7 minutes over boiling water. Rush this and you’ll get a loose, runny icing that slides off the cake.
• Chill the assembled cake for 30 minutes before slicing so the mint-wafer filling sets and cuts cleanly.

Variations

• Stud the batter with crushed candy canes for extra texture during the holidays.
• Swap peppermint extract for almond or coffee extract in the frosting for a completely different flavor profile.
• Drizzle warm chocolate ganache over the top before serving for a glossier, fancier presentation.