Marshmallow cream is the same as Fluff. I used to only use Fluff but they don't sell Fluff here. I always have my parents bring me some on their way through to AZ. Also I have only ever used butter, no fake chemical stuff in this house. Also I should note that I always have everything all measured out so I can just dump it in when the time comes and have your pan lined and greased (I just use butter) before you start. I have tried other fudge recipes and this is the easiest and the best one. Before I was allergic to nuts pb was my favorite and then I would just use a cup of pb instead of the chocolate chips.