Begin by preparing the ingredients. Dice the onion and red bell pepper, mince the garlic, and rinse the black beans and corn.
Place the chicken breasts in the bottom of the slow cooker.
Add the diced tomatoes (with their juice), black beans, corn, onion, bell pepper, and garlic over the chicken.
Pour in the chicken broth and sprinkle in the ground cumin, chili powder, paprika, lime juice, salt, and pepper.
Stir the mixture gently to combine all the ingredients, ensuring the chicken is submerged in the broth.
Cover the slow cooker and set it to cook on low for 6 hours or high for 3 hours.
Once cooking time is complete, remove the chicken breasts and shred them using two forks. Return the shredded chicken to the soup and stir to combine.
Taste and adjust seasoning if necessary.
Serve hot, garnished with tortilla strips, fresh cilantro, and avocado slices.