Preheat oven to 180C mix all marinade ingredients together in a small bowl. Pour oil into a large baking dish and place on middle shelf in the oven for 5 minutes Remove baking dish and add in potato and onion quarters and thyme and give them all a good toss (turn potatoes upright).
Brush one side of the pork chops with the marinade. Remove potatoes from oven and add pork chops, marinade side down into the pan. Brush the top side of chops with marinade. Return dish to oven and cook for 8-9 minutes.
Remove dish and turn chops over, brushing the top side again with the marinade. return to oven for 5 minutes. Turn oven off and grill onto high. Grill till potatoes are golden (about 3-4 minutes).