You are here: Home » Recipes » Chocolate Cake with Peanut Butter Frosting Chocolate Cake with Peanut Butter Frosting Recipe by Relish Yield 20 servings Peanut butter and chocolate pair up for this deliciously rich chocolate cake. Mark Boughton Photography / styling by Teresa Blackburn PrintEmail Ingredients Cake:3/4 cup granulated sugar3/4 cup brown sugar2 cups all-purpose flour2/3 cup cocoa1 1/2 teaspoons baking powder1 1/2 teaspoons baking soda1 teaspoon salt2 eggs1 cup buttermilk1/2 cup vegetable oil2 teaspoons vanilla extract1 cup boiling waterFrosting:5 tablespoons butter, softened1 1/2 cups, plus 2 tablespoons, powdered sugar1 teaspoon vanilla extract1 cup creamy peanut butter2 to 5 tablespoons 2 percent reduced-fat milk Instructions Preheat oven to 350F. Grease a 13-by-9-inch baking pan. To make cake, combine sugars, flour, cocoa, baking powder, baking soda and salt. Add eggs, milk, oil and vanilla; whisk vigorously until smooth. Stir in boiling water. Pour into prepared pan. Bake 35 minutes or until toothpick inserted in center comes out clean. Cool. To make frosting, mix butter, powdered sugar and vanilla with a mixer; beat well. Add peanut butter. Add 2 tablespoons milk slowly, beating until very creamy. Add up to 3 additional tablespoons milk if necessary to achieve desired consistency. When cake has cooled, frost top.