I have always been a fan of eggs as they are a useful source of protein.
They are also really convenient to keep in stock. Although lots of people seemed to be wary of eggs because of worries about food poisoning plus also cholesterol -- I think that has been put to rest and eggs are firmly back on the menu.
One of my favourites is an omlette made with adding cooked onions plus parmesan cheese into the beaten eggy mixture.
There has been a lot of research about older people and the need for extra protein to prevent sarcopenia (muscle wastage) and there is some about the benefits of eggs in preventing this condition