Cooked Whipped Frosting - cooking recipe

Ingredients

1 c. milk
3 Tbsp. flour
1/2 c. butter
1/2 c. shortening
1 c. sugar

Preparation

Cook and stir constantly until thick and creamy the milk and flour.
Cool completely.
Beat 4 minutes on high speed the butter and shortening.
Add sugar.
Beat 4 minutes on high speed.
Add flour and milk mixture.
Beat 4 minutes more.