Brown ground chuck with chopped onion in a large pan or Dutch oven and drain.
Add chili beans, can of tomato soup, soup can of water & chili powder sprinkled over top of chili. Stir well and cover. Bring to a boil then turn down heat to low- medium and cook for 45 minutes. Add cooked spaghetti if desired before serving. Sprinkle with Cheddar cheese.