3 tbsp. flour
1 c. milk
1 c. butter
1 c. sugar
1 tsp. vanilla

Stir milk slowly into flour in small sauce pan. Cook over medium heat, stirring constantly until thickened. In a mixer bowl place butter and sugar. Beat until well - mixed and fluffy. Add cooled flour and milk mixture and vanilla; continue beating until fluffy but do not overbeat. This icing is creamy but not too sweet.