Place chicken, onion, garlic, diced tomatoes, black beans, corn, chicken broth, taco seasoning, cumin, chili powder, salt, and pepper in a slow cooker.
Cook on low for 6-8 hours or on high for 3-4 hours.
Shred the chicken with two forks.
Serve with your favorite toppings, such as tortilla strips, avocado, sour cream, or cheese.