I've done corned beef hash as a stew, & as a kind of tray bake thing before. Both good. The baked one could be done almost totally with store cupboard ingredients, maybe improved by an onion.
DH & DD both love hot dogs (yuck) so I'm planning that even if bread rolls are not as readily available for a while, they can have them with pasta (a la Sheldon Cooper).
DH likes spam. Pancake mix will do just as well for fritters. I bet it's like tofu in that it's immensely improved by frying it.
DD & I really love sardines. We have lots of sardines - we would ordinarily, to be fair. I might try this recipe out, as we usually just get the plain ones.
I like lentils. I used to make a recipe at university that I got in a veggie students cookbok, it was literally a fried onion, then you add red lentils, rice, & water, then simmer until cooked through. If you have them, then tomato puree, stock, herbs, garlic etc improve it immensely. But it's a good, basic, filling one pot meal.
I'm undecided about buying any dried eggs, I've read they are quite good scrambled or in cake etc. I have, however bought dried milk powder. It's actually great for hot chocolate or cocoa. I genuinely prefer it to milk as it's less rich. Takes a bit more stirring though. I'm going to try making porridge with it next.