2 1/2 tbsp. flour
1/2 c. milk
1/2 c. butter
1/2 c. sugar
1/4 tsp. salt
1/2 tsp. vanilla
1 c. powdered sugar

Boil flour and milk until thick, then cool. Cream butter, sugar, salt, and vanilla. Add cooled mixture, beat until fluffy. Add powdered sugar and beat.