In a Dutch oven over medium heat, cook the beef, onions and celery until meat is no longer pink; crumble meat; drain. Dissolve bouillon in water; stir into beef mixture. Add the beans, ketchup, mustard, garlic, salt and pepper; mix well.
Transfer to an ungreased 3-qt. baking dish. Cover and bake at 375° for 60-70 minutes or until bubbly; stir. Sprinkle with bacon.