In The Netherlands we have traditional dishes called “stamppot”. It’s basically cooked potatoes and vegetables, then mashed together, topped with gravy and smoked sausage.

Two pounds of potatoes, one pound of vegetables (whole carrots, kale, endive) and two onions, prepared in a two gallon pot should be enough for 6 adult sized portions.

Gravy can be replaced with powdered gravy and the smoked sausage with (canned) hot dogs to make it cheaper.

I also like chili sin carne. Rice, canned red kidney beans, canned diced tomatoes, canned adobo sauce, garlic. Leaving out the meat, because that is usually what makes it more expensive. But great dish to make in large amounts.