When i was around 20 I asked Grandma for the recipe, since she was in Florida by then and no longer making it for us all... Imagine my surprise when she directed me to the large jars of Fluff and their "Never Fail Fudge Recipe" that is always printed on there. I have always hated Fluff, even as a kid, and these days you know I cook healthy and avoid the evil corn syrup... but I can't get away from that recipe. I've had and made others and they just don't compare.
One secret -- the fluff fudge turns out best if you let it set in the fridge or a very cold wintry garage. Other women in the family have made the fudge and it doesn't turn out as good as grandma's or mine (grandma always got a kick out of that)... It was a mystery to me how they could be messing up such a basic recipt until one year I let mine set and cool at room temperature -- and it never did taste quite the same, or have quite the same fabulous texture as all those previous batches. Somehow, setting at the colder temps noticeably improves the fudge.