Cake Icing - cooking recipe

Ingredients

1 (8 oz.) carton sour cream
2 c. powdered sugar, sifted
1 (8 oz.) carton Cool Whip
1 tsp. vanilla

Preparation

In large bowl, add all ingredients and mix (I mix by hand). Add vanilla.
Spread on cooled Duncan Hines sheet cake.
Sprinkle top with coconut or finely chopped nuts.