My DH fixed this a lot when he was single, but we like it for a quick meal. It is fairly cheap to put together, even though the cost of cheese has gone up considerably.
Slop
1 lb ground beef (ground pork is good, too)
1 can ranch style beans
1/2 medium onion
season to taste (salt, pepper, garlic powder, etc...)
1 1/2 c sharp cheddar cheese
Brown meat until just pink, add onions and seasonings. Let onions cook until clear. Stir in beans and let simmer for about 15 or 20 minutes. Spread cheese on top and let melt. You can use less cheese, but we like it cheesy.