Cut beef steak into 4 serving pieces. Place beef in 3- to 4-quart slow cooker. Mix broth, tomatoes, cumin, salt and garlic in medium bowl; pour over beef.
Cover and cook on Low heat setting 7 to 8 hours.
Stir bell pepper mixture and rice into mixture in cooker. Increase heat setting to High. Cover and cook 20 to 30 minutes or until rice is tender.