Add the chicken breasts, chicken broth, diced tomatoes with green chilies, black beans, frozen corn, diced onion, minced garlic, chili powder, cumin, paprika, salt, and black pepper to the slow cooker.
Stir to combine the ingredients evenly, then cover and cook on low for 6 hours.
Remove the chicken breasts from the slow cooker and shred them using two forks.
Return the shredded chicken to the slow cooker and stir in the lime juice.
Ladle the soup into bowls and top each serving with tortilla strips, chopped cilantro, avocado slices, shredded cheddar cheese, and sour cream.