Two of my favorite leftover recipes are 1) spaghetti fritatta, and 2) potato pancakes.
For spaghetti fritatta, take your leftover spaghetti, sauce and noodles mixed together, throw some in a pan with oil, fry until starting to get crispy. While thats frying, take 4-6 eggs (depending on how much spaghetti, it should be enough to saturate it) mix with an equal volume of milk and half as much shredded cheese. Whisk eggs, milk, cheese together and then add to pan, reduce heat to med-low. Using a spatula, push ingredients from edge to center a few times as eggs begin to firm up. Once things begin to set, whole pan goes into a 350° oven. Cook until eggs just begin to not be glossy on top. Sprinkle with shredded cheese, put back in oven for a minute or 3 til cheese is melted, remove and let rest 5 minutes. Slice pie wedges and a couple dashes of hot sauce, green onions, and you have a great dish that doesn't taste like the spaghetti you've been eating for two days, lol! Even my kids love this after I make a big batch of spaghetti.
Mashed potato pancakes are just as simple. 2C mashed potatoes, 1-2 eggs, 1/4C flour, S,P,&G. Mix together and pour into a hot pan with oil or shortening, cook until brown and set on both sides. Can add cheese, onions, green onions, whatever, they're potatoes.
Enjoy!
I don't have pics of these as they're usually done quickly as the natives get restless, lol!