Chocolate Sour Cream Frosting
["1 1/2 sticks margarine", "4 sq. semi-sweet chocolate, melted", "1 box 10x sugar", "4 Tbsp. sour cream", "1 1/2 tsp. vanilla"]
["Combine butter and chocolate in small bowl of mixer.", "Beat until thoroughly blended.", "Add sugar alternately with sour cream and vanilla."]
["margarine", "semi-sweet chocolate", "sugar", "sour cream", "vanilla"]