1 (6 oz.) pkg. chocolate pieces
4 tbsp. butter
1/2 c. sour cream
1 tsp. vanilla
1/4 tsp. salt
2 1/2 - 2 3/4 c. sifted confectioners' sugar

Melt chocolate and butter. Blend in sour cream, vanilla and salt. Gradually add confectioners' sugar until frosting is spreadable.