Preheat the oven to 425°F. Place a rimmed baking sheet in the oven while it preheats. Rub the pork chops with 1 tablespoon of the oil and sprinkle with the Italian seasoning and ½ teaspoon each salt and pepper. Set aside.
Cut the potatoes and onion into bite-size wedges. Stem and coarsely chop the peppers.
Combine the potatoes, onion, and peppers in a large bowl. Add the remaining oil and salt and pepper. Add the garlic powder and paprika. Toss gently until throughly coated.
Remove the hot sheet pan from the oven. Coat the pan with nonstick cooking spray. Quickly arrange the pork chops in a single layer on the pan (you should hear a sizzle). Surround the pork chops with the vegetables, arranging them in a single layer if possible.
Bake for 18 to 20 minutes or until the potatoes are tender. Increase the oven temperature to broil. Broil for 3 minutes or until the pork chops are browned and the vegetables are blistered. Sprinkle with parsley before serving, if desired.