Butter Cream Icing (Not Wiltons)

Why I Love This Recipe
This is a very creamy icing that has a wonderful flavor!!! It will harden up if the cake is refrigerated.
Ingredients You'll Need
5 tbsp of flour
1 cup of milk
1/4 lb. of butter
1/2 cup of shortening
1 cup of sugar
1/2 tsp of vanilla
Directions
Cook the flour and milk, stirring constantly until thick and smooth. Cool. Blend together remaining ingredients lightly. Add the flour/milk mixture when cool. Using an electric mixer, beat for 15 minutes on high speed.