Place rack of lamb on a cutting board. Slice into individual chops. Trim extra fat but keep a thin layer for flavor.
Lay chops on butcher paper. Sprinkle both sides with salt, pepper, and seasoning blend. Rub lightly to coat.
Mix olive oil, garlic, rosemary, and thyme in a bowl. Coat the chops well. Place in a bag or bowl. Marinate 30 minutes to overnight.
Set a cast-iron skillet on medium-high heat. Add a drizzle of oil and let it heat until shimmering.
Cook 3–4 chops at a time, 2–3 minutes per side, until golden brown. Work in batches so the pan isn’t crowded.
Return all chops to the pan. Add butter, garlic, rosemary, and thyme. Lower heat. Spoon melted butter over chops for extra flavor.
Remove chops and let rest 5 minutes before serving. Enjoy with mashed potatoes and spinach for a Longhorn-style plate.