Greg suggested some modifications to the standard quickie fudge recipe... which I tried and I could barely tell it from the cooked on the stove variety.
Basically:
14 oz can of sweetened condensed milk
2 1/3 c. chocolate chips (I used the cheap ones from Aldi/Save-A-Lot)
2 squares (1 oz. each) baking chocolate
2-3 T. butter
Throw everything in a big bowl together and follow Greg's instructions.