3/4 c. butter
1 egg yolk (save white)
1 c. powdered sugar
2 c. sifted flour
1/2 c. milk
1 tsp. vanilla
1 tsp. baking powder

FROSTING:

1 1/2 c. powdered sugar
Vanilla cream

Cream butter, powdered sugar, and egg yolk. Sift together flour, salt, and baking powder. Mix alternately with milk. Add vanilla. Stir in beaten egg white last. Bake at 350 degrees. Frost while still warm.