Sour Cream Chocolate Frosting
["1/4 c. butter, softened", "3 oz. melted, unsweetened chocolate", "2 c. confectioners sugar", "1/2 c. sour cream", "2 tsp. vanilla"]
["Mix butter and cooled chocolate thoroughly.", "Blend in sugar. Stir in sour cream and vanilla; beat until frosting is smooth and of spreading consistency."]
["butter", "chocolate", "confectioners sugar", "sour cream", "vanilla"]