Spray 12-inch nonstick skillet with cooking spray. Sprinkle chicken with garlic salt. Cook chicken in skillet over medium heat 6 to 8 minutes, turning occasionally, until brown on all sides.
Spray 5- to 6-quart slow cooker with cooking spray. Mix chicken, stir-fry vegetables, corn, tomatoes, broth and chilies in cooker.
Cover and cook on Low heat setting 5 to 6 hours.
Remove chicken from cooker. Stir rice into mixture in cooker; return chicken to cooker. Increase heat setting to High. Cover and cook 20 to 25 minutes or until rice is tender.