In the slow cooker, place the chicken breasts at the bottom.
Add the black beans, corn, diced tomatoes, chopped onion, and minced garlic on top of the chicken.
Pour in the chicken broth and sprinkle the chili powder, cumin, smoked paprika, salt, and pepper over the mixture.
Cover the slow cooker and set it to low for 6-8 hours or high for 3-4 hours, until the chicken is cooked through and tender.
Once cooked, remove the chicken breasts and shred them using two forks. Return the shredded chicken to the slow cooker.
Stir in the lime juice and mix well. Taste and adjust seasoning if necessary.
Serve the soup hot, garnished with diced avocado, chopped cilantro, and tortilla strips.