Heat oven to 220 C. Line a large sheet pan with parchment.
Pat the pork chops dry. Toss with olive oil, ranch seasoning, salt, and pepper. Set aside.
Toss the potatoes with olive oil, ranch seasoning, salt, pepper, garlic powder, and onion powder. Spread the potatoes on the pan in a single layer.
Roast the potatoes for 10 minutes to start the browning.
Remove the pan. Push potatoes to the sides. Place pork chops in the center. Dot butter over potatoes.
Roast 10 to 14 minutes until the pork chops reach 63 C at the thickest point and the potatoes are tender.
Rest the pork chops for 5 minutes on the pan. Sprinkle parsley. Serve with lemon wedges.