Drizzle butter in bottom of crockpot
Add chicken, onion, garlic, chicken broth, salt, and pepper
Place lid on crockpot, and cook on high for 4 hours or low for 8 hours
Remove chicken from pot, it will break apart but that's ok
whisk cream and cornstarch together, then add some of the broth from the cooker and then stir into crockpot
Stir in parsley
Place chicken back in pot, and sprinkle with parmesan
Place lid back on pot, and let cook an additional 20-30 minutes until sauce is thickened, and cheese is melted
while the sauce thickens up prepare what you're going to serve it with pasta, rice, or toasted bread
when the chicken is done serve it over your