I'm on the record as saying Thanksgiving leftover recipes are a bit silly. Most Thanksgiving leftovers are perfectly good reheated. I don't need too many ways to eat leftover stuffing, for instance; straight out of the dish is generally quite good enough (although pan-frying as a reheating method is pretty sublime).
But there are a few opportunities to not just use up leftovers, but to make something wholly new and delicious out of them. Mashed potatoes often aren't as good reheated as they were fresh, and as I had a mound of them left over, here's what I made: Crispy, creamy, cheesy mashed potato puffs.