Season the pork chops on both sides with salt, pepper, garlic powder, and onion powder.
In a medium bowl, whisk together the cream of mushroom soup, ranch seasoning mix, and chicken broth. If using sour cream, stir it in now.
Place the pork chops in the crockpot, overlapping slightly if needed.
Pour the soup mixture over the pork chops, ensuring they are well-coated.
Cover and cook on LOW for 6-8 hours or on HIGH for 3-4 hours, until the pork chops are tender and cooked through.
Optional: For a thicker gravy, remove the pork chops and whisk 1 tablespoon of cornstarch into the sauce. Cover and cook on HIGH for 10-15 minutes until thickened.
Serve the pork chops with gravy and garnish with chopped parsley if desired.