We have something which we call hamburger soup- hamburger, chopped vegetables including onions, garlic, bay leaf, canned broth, often pot barley, etc. We often add some chile because we like the flavor.

A real quicky main course- Pinto beans, not cooked to mush, are available in cans under the label Eden Organic, Eden Foods, Clinton MI. (Other brands we have tried are not as flavorful).
Empty a can of beans (or two) in a pot. Put in left-over roast, cooked ham, etc. cut-up. Add some red chile, oregano, and garlic. Add a little water and heat. Serve with chopped onion and grated cheese, which one can add according to taste. Serve with a good bread or whatever. Not the real chile con carne y frijoles, but cheap, filling and almost as good.