Place the onion, corn, green chilies, diced tomatoes with green chilies, black beans, tomato sauce in a slow cooker. Add taco seasoning, garlic powder, cumin and broth, stir well.
Lay chicken breasts on top of the mixture
Cook on low for 7-8 hours or cook on high heat for 4 hours
Remove the chicken from the slow cooker, use fork and shred the chicken into small pieces. Place the chicken back into slow cooker. Add salt/pepper to taste
Turn off the slow cooker and serve with cilantro, jalapeño, corn tortilla chips or other toppings of your choice