I like to use up any scrap of food rather than waste it. Food is too expensive to throw away leftovers and I just can't bear waste so I freeze any thing from cheese sauce to leftover pie. Cheese sauce freezes well and when I have enough small pots to combine together we use it up. Had some mashed potato in the fridge and a half tin of baked beans so made a nice lunch with these leftovers. I mixed grated cheese with the mash and shaped into patties and dusted with flour. I fried these in a little oil and butter until golden brown.
The baked beans were just reheated and served on the patties with a small grating of extra cheese and a small dollop of brown sauce. This was real comfort food, really tasty too.