1Spray 3- to 4-quart slow cooker with cooking spray. in slow cooker, mix chicken, broth, corn, tomatoes, black beans, bell pepper, onion, tortilla strips from 6 of the tortillas, the chili powder, cumin, salt, red pepper and cilantro.
2Cover; cook on Low heat setting 5 to 7 hours (or on High heat setting 3 to 4 hours) or until juice of chicken is clear when center of thickest part is cut (at least 165°F).
3Remove chicken; shred with 2 forks. Return to slow cooker. Stir in cilantro.
4In 9-inch nonstick skillet, heat oil over medium heat. Cook remaining tortilla strips in oil 3 to 5 minutes, stirring occasionally, until crisp and light golden brown. Top individual servings of soup with tortilla strips. Garnish with lime wedges and avocado.