01 - Preheat oven to 425°F. Line large sheet pan with parchment paper.
02 - Toss potatoes, carrots, and red onion with 2 tbsp olive oil, half the garlic, rosemary, thyme, lemon zest, salt, and pepper. Spread evenly on sheet pan.
03 - Roast vegetables for 20 minutes.
04 - Pat lamb chops dry. Rub with remaining olive oil, garlic, rosemary, thyme, lemon juice, salt, and pepper.
05 - Remove pan from oven. Arrange lamb chops and asparagus among partially roasted vegetables.
06 - Return to oven and roast 18-20 minutes, flipping lamb chops halfway, until lamb reaches desired doneness and vegetables are tender.
07 - Serve hot, garnished with fresh parsley and extra lemon wedges if desired.