Hershey's "PERFECTLY CHOCOLATE" Chocolate Frosting
1/2 cup (1 stick) butter
2/3 cup unsweetened cocoa
3 cups powdered sugar
1/3 cup milk
1 teaspoon vanilla extract
Melt butter. Stir in cocoa.
Alternately add powdered sugar and milk, beating to spreading consistency.
Add small amount additional milk, if needed. Stir in vanilla.
Makes about 2 cups frosting (enough for 2 layer cake)