With left over rice and vegetables, adding egg and soy sauce, you can make fried rice.
With left over vegetables, adding tomato soup and or tomato juice, maybe even some rice or pasta, make vegetable soup.
You can make burritos with leftover meats, cheeses, etc..
Also, pot pies with leftover veges, just adding meat, pie crusts and cream of “whatever” soup you like.
If I think of more I will post more….
Marsha