Mary'S Chocolate Cake Frosting - cooking recipe

Ingredients

1/2 c. butter
3 sq. (1 oz. each) unsweetened chocolate
3 sq. (1 oz.) semi-sweet chocolate
5 c. powdered sugar
1 c. (8 oz.) sour cream
2 tsp. vanilla

Preparation

In medium saucepan, melt butter and chocolate over low heat. Can melt in microwave.
Cool several minutes.
Combine sugar and sour cream and beat until smooth.
Frost cooled cake.