Chocolate Buttercream Icing Recipe Get ingredients: 8 oz (1 cup) butter (unsalted, room temperature, around 65° F / 18° C) 2 oz (1/2 cup) cocoa powder 2 tsp vanilla extract 1 oz (1/8 cup) milk 14 oz (3 1/2 cups) powdered sugar 1/2 tsp salt digital scale stand mixer spatula sifter 1 tsp, 1/2 tsp Attach the whisk to the mixer. Add to mixer mixing bowl: 8 oz (1 cup) butter (chopped into about 8 pieces) Mix on low-then-high speed until smooth. Attach the plastic guard to the mixer. Slowly sift into mixer mixing bowl: 14 oz (3 1/2 cups) powdered sugar 2 oz (1/2 cup) cocoa powder Mix on low speed until combined. Add to mixer mixing bowl: 2 tsp vanilla 1/2 tsp salt 1 oz (1/8 cup) milk Mix on medium speed (about 3 minutes). If it's not stiff enough, add more powdered sugar. If it's too thick, add more milk. Turn off the mixer. Ice the cake.