1 c. semi-sweet chocolate chips (6 oz.)
4 oz. chocolate (mint patties broken up)
1/2 c. undiluted evaporated milk
1/2 c. light corn syrup
1 tbsp. butter

In medium saucepan combine chocolate pieces, mint patties, milk and corn syrup. Cook over medium low heat, stirring constantly until all ingredients are melted. Remove from heat, stir in butter until melted. Store covered in refrigerator. Warm for easy pouring.