Place chicken breasts in the slow cooker.
- In a bowl, whisk together cream cheese, heavy cream, chicken broth, Italian seasoning, garlic powder, onion powder, salt, and pepper.
- Pour the mixture over the chicken. Cover and cook on low for 5–6 hours or on high for 2–3 hours, until chicken is tender and fully cooked.
- Cook pasta separately according to package directions. Drain and set aside.
- Remove chicken from the slow cooker and shred with two forks. Return it to the sauce.
- Stir in mozzarella and Parmesan until melted and creamy.
- Add cooked pasta and toss to coat in the sauce.
- Garnish with parsley and serve hot.