1/2 c. butter
1/3 c. milk
2 (1-oz.) squared unsweetened baking chocolate
3 1/2 c. powdered sugar
1 tsp. vanilla
Melt the baking chocolate squares in the microwave. In a medium saucepan, bring butter and milk to a boil. Remove from heat. Add melted chocolate, powdered sugar, and vanilla. Beat until smooth.