White Chocolate Mocha Frosting Be The First To Review By Anonymous recipe I threw together this frosting for my birthday cake. I used a devil’s food cake, and it was very well received. White Chocolate Mocha Frosting Ingredients 2 ounces white chocolate1/2 cup butter1/2 teaspoon vanilla extract1/2 cup milk5 teaspoons instant coffee granules3 cups confectioners’ sugar Instructions 1 Mix the instant coffee with the milk, and let it stand until coffee is dissolved. 2 Melt the butter and chocolate together, and beat until smooth, then add vanilla. 3 Beat in 1 cup of confectioners sugar. Add half the milk mixture, then 1 cup confectioners sugar, then the other half of the milk, then 1 cup confectioners sugar.