Place the chicken, heavy cream, chicken broth, cream cheese, butter, garlic powder, Italian seasoning, salt and pepper in your slow cooker.
Cook on high for 3 to 4 hours, or low for 6 to 8 hours.
Remove the chicken from the slow cooker. Shred with forks or cube the chicken.
Whisk the parmesan cheese into the sauce.
Place the noodles in your slow cooker. They will fit in most slow cookers, but if they do not fit in yours you can break them in half. Use a spoon to make sure the noodles are submerged in the liquid. (It will be very saucy at this point - that is ok!)
Add the chicken on top of the pasta.
Cook on high for about 45 minutes, stirring occasionally to prevent the noodles from sticking. Test for doneness, and cook another 15 minutes if needed.