In a large skillet, cook the beef, onions and celery over medium heat until meat is no longer pink; drain.
Transfer to a 5-qt. slow cooker. Stir in the cabbage, stewed tomatoes, beans, diced tomatoes, ketchup, chili powder, oregano, pepper and salt. Cover and cook on low for 6-8 hours or until cabbage is tender.
Serve with sour cream and cheese if desired. Yield: 8 servings (2 quarts).