In a bowl, whisk together the olive oil, rosemary, thyme, garlic, lemon zest, lemon juice, Dijon mustard, salt, and pepper.
Coat the lamb chops thoroughly in the marinade. Cover and refrigerate at least 1 hour, or overnight for best results.
Make the garlic butter: mash the softened butter with the minced garlic, chopped rosemary and thyme, lemon zest, and a pinch of salt. Set aside at room temperature.
Preheat the Blackstone griddle to medium-high heat (about 375°F to 400°F).
Remove the chops from the marinade and let them come to room temperature, about 20 minutes.
Lightly oil the griddle. Place the chops down and cook 4 to 5 minutes per side for medium-rare, flipping only once.
Check the internal temperature with a meat thermometer, 145°F for medium-rare.
Top each chop with a spoonful of garlic butter and let rest 5 minutes so the juices redistribute and the butter melts into a sauce.
Garnish with fresh herbs and serve with lemon wedges.