1 (6 ounce) package semisweet chocolate chips 1/4 cup butter 1/2 cup sour cream 1 teaspoon vanilla extract 1/4 teaspoon salt 3 cups confectioners'' sugar, sifted
In the top of a double boiler set over medium-high heat, melt chocolate and butter, stirring occasionally until smooth. Cool slightly. Place in large mixing bowl of an electric mixer.
In a small bowl, combine sour cream, vanilla extract and salt. Stir into chocolate and mix well on low speed, about 1 minute. Slowly beat in confectioners' sugar and mix to spreading consistency, about 2 minutes.