Special Chocolate Frosting
- 1 cup cocoa
- 1 teaspoon vanilla extract
- ½ cup butter or margarine, softened
- 4 ½ cups sifted powdered sugar
- ¼ cup milk
- 1 egg yolk
Cream butter; add egg yolk and cocoa, beating well. Add sugar alternately with milk, beating until smooth enough to spread. Stir in vanilla.