Whipped Cream Frosting
["4 Tbsp. flour", "1 c. milk", "1/2 c. shortening", "1/2 c. margarine", "1 c. sugar", "1 tsp. vanilla"]
["Mix together flour and milk; cook until thick, stirring constantly.", "Cool thoroughly.", "Beat shortening, margarine, sugar and vanilla at high speed until creamy, about 5 minutes.", "Add the cooled mixture and beat until fluffy."]
["flour", "milk", "shortening", "margarine", "sugar", "vanilla"]