01 - Preheat oven to 400°F.
02 - Pat the lamb rack dry and season generously with salt and pepper.
03 - Heat 1 tbsp olive oil in a heavy, oven-safe skillet over medium-high heat. Sear the lamb rack for 2–3 minutes on each side until browned. Remove from heat and set aside.
04 - In a bowl, combine parsley, rosemary, thyme, garlic, breadcrumbs, Parmesan (if using), and 2 tbsp olive oil. Mix to form a moist crumb mixture.
05 - Brush the seared lamb rack with Dijon mustard on the meat side. Press the herb mixture evenly onto the mustard-coated surface to form a crust.
06 - Place the lamb rack, herb-crust side up, back in the skillet or on a baking sheet. Roast in the preheated oven for 15–18 minutes for medium-rare (internal temperature 130–135°F), or to your preferred doneness.
07 - Remove from oven, tent with foil, and let rest for 10 minutes.
08 - Slice into individual chops and serve immediately.