Prepare the marinade: In a small bowl, combine olive oil, garlic, rosemary, thyme, salt, pepper, and red pepper flakes.
Season lamb chops: Rub the mixture evenly over both sides of the lamb chops. Let sit at room temperature for 20 minutes (or refrigerate for up to 4 hours).
Preheat grill or skillet: Heat a cast iron skillet or outdoor grill over medium-high heat. Lightly oil the grates if grilling.
Cook lamb chops: Place chops on the grill or skillet. Cook for 3–4 minutes per side for medium-rare, or longer depending on your preference.
Rest & garnish: Let chops rest for 5 minutes before serving. Garnish with parsley and chopped nuts if desired.