Ingredients
- For the cake:
- 4 tablespoons unsalted butter, softened
- 1/4 cup + 2 tablespoons sugar
- 1 egg yolk
- 1/2 teaspoon vanilla
- 1/2 cup flour
- 1 tablespoon + 1 teaspoon unsweetened cocoa powder
- 1/4 teaspoon baking soda
- 1/8 teaspoon salt
- 2 tablespoons buttermilk
- 1/4 cup Dr. Pepper (don't use diet)
- For the frosting:
- 1 tablespoon butter
- 2 teaspoon cocoa powder
- 2 tablespoons Dr. Pepper
- 1 cup powdered sugar
- 1/4 teaspoon vanilla
Preparation
Step 1
Preheat the oven to 350, and grease a 6" round cake pan or spray with cooking spray.
Beat the butter and sugar until fluffy and well-combined. Add the egg yolk and vanilla and mix until combined.
In a small bowl, whisk together the flour, cocoa powder, baking soda and salt. In another small bowl, stir together the Dr. Pepper and buttermilk. Add one-third of the flour mixture to the butter and sugar mixture and beat until lightly combined. Alternating, add the liquid and flour mixtures.
Scrap the batter into the cake pan, and bake on a baking sheet for 25-30 minutes, or until a toothpick inserted comes out with only a few crumbs clinging.
Once you pull the cake from the oven, begin making the icing. Melt the butter, cocoa powder and Dr. Pepper in the microwave. Once the butter is melted and the mixture slightly bubbles, pour in the powdered sugar and little at a time, whisking vigorously by hand. When all the powdered sugar is incorporated, pour the warm frosting over the warm cake. Let cool slightly before serving.