Chocolate Buttercream Frosting A Baked By Jen Original Makes enough to frost a 2-layer 8-inch cake 3 sticks unsalted butter, room temperature 6 cups powdered sugar 1/2 cup cocoa powder 2 teaspoon vanilla extract 1-2 tablespoons milk Beat butter in mixer on low to medium speeds until creamy. Sift into the bowl powdered sugar and cocoa powder. Resume mixing at low to medium speeds, stoping to scrape down the bowl occasionally, until incorporated. Stir in vanilla extract. Stir in enough milk until desired consistency is reached.