I originally got a version of this fudge off this site, but when I came back to add it to my cookbook after I finally got around to trying it, the recipe was gone. It's one of the simplest recipes! I made 2 batches of this one with dark chocolate and one with white chocolate (since I'm weird and don't like dark chocolate). They both turned out great!
Variations: You can use different types of chips (white chocolate, butterscotch, etc), flavorings (mint extract instead of vanilla) and also add toppings and mix-ins such as nuts and candies.