Place the boneless, skinless chicken breasts in the slow cooker.
Add black beans, diced tomatoes, frozen corn, chopped onion, diced bell pepper, minced garlic, and minced jalapeño (if using).
Pour in the chicken broth and add ground cumin, chili powder, paprika, ground coriander, salt, and pepper.
Stir the ingredients in the slow cooker to combine the spices evenly.
Cover and cook on low for 6-8 hours or on high for 3-4 hours until the chicken is cooked through and tender.
About 30 minutes before serving, shred the cooked chicken using two forks and return it to the slow cooker.
Add the lime juice and stir to incorporate the flavors.
Taste and adjust the seasoning if needed.
Serve the Slow Cooker Chicken Tortilla Soup hot, garnished with fresh cilantro, shredded cheese, avocado slices, and tortilla strips.
Enjoy this comforting and flavorful Chicken Tortilla Soup made effortlessly in your slow cooker!