we use this on cupcakes, cakes, etc - it's very good
2 3/4 cups confectioners' sugar
6 tablespoons unsweetened cocoa powder
6 tablespoons butter
5 tablespoons evaporated milk
1 teaspoon vanilla extract
1.In a medium bowl, sift together the confectioners' sugar and cocoa, and set aside.
2.In a large bowl, cream butter until smooth, then gradually beat in sugar mixture alternately with evaporated milk. Blend in vanilla. Beat until light and fluffy. If necessary, adjust consistency with more milk or sugar.