Use only real butter and marshmallows, the treats made from the fluff stuff in a jar are just not the same to me. Keep them classic, no added stuff, classic is the best.
My biggest problem when I make them is that I eat it all out of the pan and never get it into the dish to cool, set and serve.
I've had them made with Captain Crunch Peanut Butter cereal, totally different experience but tasty nonetheless