Place the chicken breasts in the bottom of the crockpot. Season with salt, black pepper, garlic powder, onion powder, and Italian seasoning.
Pour the chicken broth over the seasoned chicken. Cover and cook on low for 6-7 hours or on 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 heavy cream and grated Parmesan cheese until well combined.
Add the uncooked penne pasta and frozen peas to the mixture, stirring to combine. Cover and cook on high for an additional 30-40 minutes, or until the pasta is cooked al dente.
Once the pasta is cooked, give it a good stir, and adjust seasoning if necessary. Garnish with chopped parsley before serving.