Grease the crockpot lightly and place chicken breasts at the bottom.
Add heavy cream, chicken broth, garlic, Italian seasoning, salt, and pepper. Stir gently to combine.
Scatter cream cheese cubes on top. Cover and cook on low for 4-5 hours.
Cook pasta according to package instructions. Drain and set aside.
Shred the chicken in the crockpot using two forks. Stir to mix with the sauce.
Add Parmesan cheese and butter to the crockpot and mix until creamy.
Combine cooked pasta with the sauce and toss to coat evenly.
Garnish with parsley and serve warm.