Preheat oven to 450˚F. Line a large baking sheet with aluminum foil.
Mix together olive oil, minced garlic, chopped rosemary, and chopped thyme in a small bowl. Pat the herb mixture all over the meat on the racks of lamb. Place the racks on the prepared sheet pan and add to the center rack of the oven.
Roast lamb for approximately 30 minutes, until it reaches an internal temperature of 135-140 degrees F.