Season the chicken breasts with salt, black pepper, garlic powder, onion powder, and Italian seasoning. Place them in the crockpot.
Pour the chicken broth and heavy cream over the chicken. Cover and cook on low for 6-7 hours or high for 3-4 hours until the chicken is cooked through and tender.
Once the chicken is cooked, remove it from the crockpot and shred it using two forks. Return the shredded chicken to the crockpot.
Stir in the grated Parmesan cheese until melted and well combined.
Add the penne pasta to the crockpot, ensuring it's submerged in the sauce. Cover and cook on high for an additional 30 minutes, or until the pasta is cooked al dente.
Stir in the fresh spinach and cook for an additional 5 minutes until wilted.
Serve hot, garnished with chopped parsley.