Spray the crockpot with non stick cooking spray. Place the chicken in a single layer on the bottom of the slow cooker. Pour the Italian dressing on top of the chicken. Cut cream cheese into small pieces and put on top of the chicken.
Sprinkle the salt, pepper and parmesan cheese on top. Cook in the slow cooker - if cooking on high cook for 4 hours, if cooking on low cook for 6 hours.
When there is 20 minutes left of the cook time, if you are serving with pasta start boiling the water and cook the pasta. Drain pasta and set aside. Once the chicken is cooked use 2 forks to shred the chicken and mix the chicken with the sauce to completely mix everything together.
Add the drained pasta to the slow cooker and mix everything so the pasta, chicken and sauce are all mixed well. Serve the pasta on plates and top with additional parmesan cheese and parsley.