Spray 4- to 5-quart slow cooker with cooking spray. In slow cooker, mix potatoes, corn, carrots, celery, onion and garlic. Stir in salsa, cumin, chili powder and pepper. Place chicken on top of vegetable mixture. Pour broth over ingredients.
Cover; cook on High heat setting 4 hours.
Remove chicken from slow cooker to plate. Shred using 2 forks. Return chicken to slow cooker. Stir tortilla strips into stew. Garnish with cilantro.