Ingredients
Method
- Sift flour, 1/4 cup cocoa, baking soda, and salt into a bowl; whisk 30 seconds.
- Whisk milk, buttermilk, oil, sugar, egg, and 1 teaspoon vanilla until smooth, about 1 minute.
- Heat oven to 350°F. Grease and line a 6-inch pan. Fold wet into dry, then stir in hot water. Bake 25-30 minutes.
- Cool cake completely. Beat butter, then sift in powdered sugar and cocoa; add 2 tablespoons milk and 1/2 teaspoon vanilla. Whip until fluffy. Frost and serve.
Notes
The cake needs to cool fully before frosting, about 1 hour, which is not included in the total time. If you prefer a thinner frosting, add an extra splash of milk.
