1 (6 oz.) pkg. chocolate chips
1 oz. unsweetened chocolate
1/3 c. butter
2 c. 10x sugar
2 (5 oz.) cans evaporated milk
1 tsp. vanilla

Melt chocolate, vanilla and butter. Add remaining ingredients and cook until bubbly. Cool. (Hot fudge sauce will thicken as it cools.) Serve warm.