Mock Whipped Cream Icing
["3/4 c. sugar", "1 stick margarine", "1/2 c. shortening", "5 Tbsp. flour", "1/2 c. milk", "1 tsp. vanilla"]
["Beat all together, about 10 to 12 minutes.", "Should be thick enough to spread.", "Do not cook."]
["sugar", "margarine", "shortening", "flour", "milk", "vanilla"]