Spray the bottom of the slow cooker with nonstick cooking spray.
Place the chicken breasts at the bottom of the slow cooker.
Add black beans, corn, Rotel tomatoes, ranch seasoning, cumin, chili powder, onion powder, and water. Mix gently to combine.
Place the block of cream cheese on top without stirring.
Cook on LOW for 6–8 hours or HIGH for 4 hours.
Once cooked, shred the chicken and stir the cream cheese into the chili until creamy.
Serve hot with desired toppings such as shredded cheese, sour cream, avocado slices, or tortilla chips.