Place chicken breasts at the bottom of a 6-quart slow cooker.
Add the onion, red pepper, green pepper, garlic, black beans, diced tomatoes, and corn over the chicken.
In a small bowl, combine chili powder, cumin, smoked paprika, salt, and black pepper.
Sprinkle the seasoning blend over the ingredients in the slow cooker and pour in the chicken broth.
Cover and cook on LOW for 6 hours or HIGH for 3 hours until chicken is tender.
Remove the chicken to a plate and shred using two forks.
Return the shredded chicken to the slow cooker and stir in the fresh lime juice and chopped cilantro.
Stir well to incorporate and serve hot with optional toppings such as avocado or sour cream.