3/4 cup chocolate chips (i use milk, because I love something VERY rich, but semi sweet will do)
1/4 cup butter (the real stuff, margarine doesn't taste the same)
2/3 cup white sugar
2/3 cup heavy cream
Melt chocolate and butter in 2-quart saucepan over low heat until smooth (3 to 5 minutes).
Stir in sugar and milk.
Increase heat to medium; cook, stirring constantly, until mixture comes to a full boil (8 to 10 minutes).
Continue cooking, stirring constantly, 4 minutes. .
Store in glass jar in the refrigerator.
Stays good for a week, but it won't last that long!