To - a cook on 11/13/06 from - a cook 11/8/06. I have always used chocolate chips with this recipe and not squares. For the semi/milk/peanut butter chip I use about a half a bag of milk choc chips, a half a bag of peanut butter chips, and about 3/4 cup semi sweet chips, as a substitution. Usually, I am so busy stirring and moving the pan off the heat I eyeball the amount of chips that go into the pan. I hope that helps. I also have used white chocolate chips and swirled the white and dark chocolate fudge, however for some reason it never turns out right. The white chocolate gets a bit like paste. So if anyone has tried using white chips with this recipe with success - let me know the secret.