Place chicken breasts at the bottom of the slow cooker.
Add diced tomatoes with green chiles, corn, black beans, ranch seasoning, chili powder, cumin, garlic powder, onion powder, salt, and pepper over the chicken.
Pour chicken broth evenly over the mixture.
Place the cream cheese block on top of all ingredients.
Cover and cook on LOW for 6 to 7 hours or on HIGH for 3 to 4 hours until the chicken is fully cooked and tender.
Using two forks, shred the chicken directly in the slow cooker.
Stir well to combine the melted cream cheese thoroughly, making the chili creamy.
Serve hot in bowls and garnish with shredded cheddar, cilantro, green onions, crushed tortilla chips, or sour cream as desired.