In the basin of your crockpot, combine the heavy cream, broth, cream cheese, butter and garlic. The cream cheese and butter will remain cubes, this is ok it will melt into the mix as it cooks.
Add your chicken into the crockpot and season with Italian seasoning, salt, pepper and onion powder.
Cover and cook on low for 4 hours or high for 2 hours.
About 30 minutes before the chicken is done, boil the rigatoni according to package instructions.
Use a meat thermometer to check that the internal temperature of the chicken has reached 165°F.
Using 2 forks or a shredding tool, shred the chicken inside the crockpot.
Stir the parmesan cheese into the sauce until melted and then stir in your noodles.
Garnish with parsley and serve warm.