Place the chicken breasts in the bottom of a slow cooker.
Add black beans, kidney beans, corn, diced tomatoes with green chilies, and tomato sauce.
Pour in the chicken broth and sprinkle in taco seasoning, cumin, chili powder, garlic powder, onion powder, salt, and pepper.
Add diced onion and bell pepper for extra flavor.
Cover and cook on low for 6-8 hours or on high for 3-4 hours.
Once cooked, shred the chicken with two forks and stir it back into the soup.
Stir in lime juice and chopped cilantro just before serving.
Serve hot with tortilla chips, shredded cheese, and sour cream.