While you can customize your fudge by adding chopped nuts or trying another flavor of frosting, I recommend sticking to a creamy, no-stir brand peanut butter. Jif, Skippy, and Peter Pan all work.

Our favorite is Jif Creamy, but use whatever you have. We do suggest leaving out the natural kinds, however. Natural peanut butter may well lead to crumbly peanut butter balls that don't retain ...