2 tbsp. cornstarch
1 1/2 c. milk
1/2 c. butter
1/2 c. shortening
1 c. sugar
1 tsp. vanilla
1/4 tsp. salt

Combine cornstarch and milk, cook over low heat until thick. Cool by placing pan in ice water; cool thoroughly. Cream butter, shortening; add vanilla and salt. Add sugar gradually; beat until light and fluffy. Add cooled milk mixture to shortening, beat until the consistency of rich whipped cream. Yield: 2 cups frosting.