1 tsp. vanilla
1/2 c. milk
2 tbsp. flour
1/2 c. butter, softened
1/2 c. granulated sugar

In small saucepan on low heat cook milk and flour until thickened. Set aside, let cool. In mixing bowl add vanilla, sugar and butter (not melted but room temperature). Add thickened cooked milk and flour. Mix high speed until creamy.