Second the roast chicken idea, as well as the eggs
You can always make vegetarian chili mac, its prety cheap, beans, tinned tomatoes, etc- make a bean chili and add macaroni to it, basically
French toast
Pancakes
Omlettes
Fried Egg Sandwiches
Rice and beans
Roast chicken, coronation chicken/chicken salad sandwiches, shredded chicken with pasta and frozen veg mixed in with italian seasoning, chicken and rice, chicken chili, etc
spaghetti and marinara sauce
campfire stew- stewing beef, frozen veg, tinned tomatoes, cooked in a crock pot
Any cut of meat that takes a long time stewing- like pot roast, that's pretty cheap and then you can make beef burritos, beef stroganof, etc