Preheat the oven to 400°.
Brush the rack with oil, and sprinkle it with salt and pepper. Put the rack in a roasting pan, and roast it in the preheated oven for 12 minutes
Remove the meat from the oven, and coat it with the mustard
Lower the oven temperature to 350°
Combine the bread crumbs, parsley, shallot, garlic, thyme and melted butter. Spread this mixture over the top of the rack. Put the rack in the 350° oven, and roast for another 15 minutes
Remove the rack from the oven, and let it rest for 10 minutes before carving it into chops. The lamb will medium rare.