2 1/2 tbsp. flour
1/2 c. milk
1/2 c. butter
1/2 c. shortening
3/4 c. granulated sugar
1 tsp. vanilla

Blend flour and milk and cook to a paste. Cool. Beat remaining ingredients. Add flour and milk mixture and beat until creamy. Enough for a 9 inch two layer cake. Store in refrigerator after applying to cake.