3 tbsp. flour
1 c. milk
1/2 c. butter (soft)
1/2 c. Crisco
1/8 tsp. salt
1 c. granulated sugar
1 tsp. vanilla or other flavoring

Mix flour and milk until smooth, cook slowly, stirring constantly until thick. Remove from heat and cool. Add butter and shortening, blend at low speed, add salt.

Beat at high speed until smooth and fluffy. Blend sugar until its dissolved. Add vanilla and beat at high speed.