1 (12 oz.) pkg. Baker's semi-sweet chocolate chips
1 c. butter
2 2/3 c. evaporated milk
4 c. sifted confectioners' sugar
2 tsp. vanilla

Melt chips and butter over low heat. Gradually add sugar and milk, blending well. Bring to boil and cook 8 minutes, stirring constantly. Add vanilla. Makes 5 1/2 cups sauce. Serve warm. Keeps in refrigerator forever!