- 2 cups sugar
- 1 3/4 cups all-purpose flour
- 3/4 cup unsweetened cocoa powder
- 2 tablespoons King Arthur Flour Black Cocoa, optional
- 2 teaspoons baking soda
- 1 teaspoon baking powder
- 1 teaspoon kosher salt
- 2 eggs
- 1 cup buttermilk
- 1 cup strong black coffee (I used Green Mountain Coffee’s Vermont Country Blend)
- 1/2 cup vegetable oil
- 2 teaspoons vanilla extract
- 1 cup unsalted butter (2 sticks or 1/2 pound), softened (but not melted!)
- 3 1/2 cups confectioners (powdered) sugar
- 1/2 cup cocoa powder
- 1/2 teaspoon table salt
- 2 teaspoons vanilla extract or 1 teaspoon almond extract
- 4 tablespoons milk or heavy cream
Heat oven to 350°F. Grease and flour two 9-inch round baking pans or one 13x9x2-inch baking pan. Set aside. In the bowl of a stand mixer fitted with the whisk attachment or in a large bowl with an electric mixer, combine the sugar, flour, cocoa(s), baking soda, baking powder and salt. Mix on low until dry ingredients are thoroughly combined.
Add eggs, buttermilk, coffee, oil and vanilla. Beat on medium speed for about two minutes; the batter will be thin.
Pour batter evenly into prepared pans.
Bake in preheated oven for 30 to 35 minutes for round pans, 35 to 40 minutes for rectangular pan or until wooden toothpick inserted in center comes out clean.
Cool 10 minutes; remove from pans to wire racks. Cool completely.
Cream butter for a few minutes in a mixer with the paddle attachment on medium speed. Turn off the mixer. Sift 3 cups powdered sugar and cocoa into the mixing bowl. Turn your mixer on the lowest speed (so the dry ingredients do not blow everywhere) until the sugar and cocoa are absorbed by the butter. Increase mixer speed to medium and add vanilla extract, salt, and milk/cream and beat for 3 minutes. If your frosting needs a more stiff consistency, add a little more sugar. If your frosting needs to be thinned out, add additional milk 1 tablespoon at a time.