Remove lamb racks from fridge an hour or two before cooking. Heat oven to 400 degrees. In a small bowl mix garlic, herbs, salt, pepper and and 2 T olive oil. Set aside.
Rub racks with remaining olive oil and generously season with salt and pepper. Sear both sides on grill or on the stovetop, about 5 minutes each side.
Smear garlic, olive oil and herb mixture on both sides of the racks, place on roasting pan in middle of the oven. Check with a thermometer after 10 minutes. It will probably take 12-15 minutes. Racks are medium rare when they reach internal temperature of 120 degrees. Remove and let sit covered for 10 minutes before slicing.