Creamy White Frosting - cooking recipe

Ingredients

1 c. milk
3 Tbsp. flour
1 stick margarine
1 c. sugar
1/2 c. shortening
1/2 tsp. vanilla
1/8 tsp. salt

Preparation

Mix milk and flour.
Cook over heat until thick.
Cool completely, stirring occasionally.
Mix remaining ingredients in bowl.
Add cooked mixture.
Beat 15 minutes on high until fluffy.