Step 1

1 In medium bowl, beat powdered sugar and butter with spoon or electric mixer on low speed until blended. Stir in vanilla and chocolate.

Step 2

2 Gradually beat in just enough milk to make frosting smooth and spreadable. If frosting is too thick, beat in more milk, a few drops at a time. If frosting becomes too thin, beat in a small amount of powdered sugar. Frosts 13x9-inch cake generously, or fills and frosts an 8- or 9-inch two-layer cake.