Put the chicken breasts in a greased or lined slow cooker.
In a medium bowl, beat the softened cream cheese until smooth. Add the cream of chicken soup, chicken broth, onion powder, garlic powder, and black pepper. Stir at a low speed to combine. Pour over the chicken in a slow cooker.
Cover and cook on low for 5-6 hours or high for 3-4 hours or until the chicken is fully cooked.
Remove the chicken and cut it into bite-sized pieces before returning it to the crockpot.
Stir in the rice, corn, and shredded cheddar cheese. Cover and cook on low for 20-25 minutes or until the rice is tender. Garnish with parsley and season with salt and pepper to taste.