In a large skillet over medium-high heat, cook ground beef, onions, green pepper, and celery. Stir occasionally until beef is no longer pink (about 7-8 minutes). Crumble meat as it cooks.
Stir in the garlic and cook for an additional minute. Drain any excess grease.
Transfer the beef and veggie mixture to a 4- or 5-quart slow cooker.
Add converted rice, diced tomatoes, tomato paste, salt, sugar, chili powder, pepper, and water. Give everything a good stir.
Cover and cook on low for 4-5 hours, stirring once halfway through.
Once done, top with sliced olives and shredded cheddar cheese before serving. Enjoy!