Butter Icing Be The First To Review By monie5251996 recipe Butter icing is a quick and attractive topping for a cake. Butter Icing Ingredients 1/2 cup unsalted butter, softened2 cups icing (confectioners) sugar, sifted2 tsp milk1 tsp vanilla essense (extract) Instructions Place the butter in a bowl. Using a wooden spoon or electric mixer, beat until light and fluffy. Stir in sugar, milk and vanilla until evenly mixed, then beat well until light and smooth. Spread the icing over the cake with a metal spatula.