Frosting - cooking recipe

Ingredients

1 c. milk
2 Tbsp. cornstarch
1/2 c. butter or oleo
1/2 c. solid shortening
1 c. sugar
1 tsp. vanilla

Preparation

Cook milk and cornstarch until thick.
Mix butter (or oleo), shortening and sugar.
Beat for 10 minutes using electric mixer. Add cornstarch mixture after cooling.
Add vanilla.
Beat until smooth.