Season the chicken with salt, pepper, garlic powder, onion powder, paprika, and Italian seasoning.
Place the chicken in the crockpot.
Add the butter, minced garlic, chicken broth, and cream of chicken soup.
Cover and cook on LOW for 4 to 5 hours or HIGH for 2½ to 3 hours.
Remove the chicken and shred it using two forks.
Return the shredded chicken to the crockpot.
Stir in the uncooked rice.
Cover and cook on HIGH for 30 to 40 minutes, stirring once if needed, until the rice is tender.
Add the broccoli florets, heavy cream, and shredded cheddar cheese.
Stir until the cheese melts and the broccoli is tender, about 10 to 15 minutes.
Sprinkle with fresh parsley before serving.