In a 5–6 quart slow cooker, whisk together the onion soup mix, 14 ounces low-sodium chicken broth, cream of chicken soup, and dry pork gravy mix until blended.
Sprinkle both sides of the pork chops with garlic powder.
Place seasoned pork chops in the slow cooker, laying them flat. Pour the gravy mixture over the pork chops, ensuring they're fully coated.
Cover and cook on Low for 4–6 hours, until the pork chops are tender and reach at least 145°F in the thickest part.
In a small bowl, whisk together 3 tablespoons of cornstarch and 3 tablespoons of cold water to form a slurry. Add the slurry to the slow cooker and stir into the gravy.
Cover and set the slow cooker to high, cooking for an additional 30 minutes to thicken the gravy.
Turn off the slow cooker. Transfer the pork chops to a platter and let them rest for three minutes. Serve with the gravy on top or on the side and garnish with parsley if desired.
Notes
For best results, do not remove the lid of the slow cooker during the initial cooking time. Serve with mashed potatoes or rice to soak up the delicious gravy.