In a bowl, mix together olive oil, rosemary, thyme, garlic, lemon zest, lemon juice, Dijon mustard, salt, and black pepper.
Coat the lamb chops thoroughly with the marinade.
Cover and refrigerate for at least 1 hour, or overnight for best results.
Heat your Blackstone griddle to medium-high heat (around 375°F to 400°F).
Remove lamb chops from the marinade and let them come to room temperature.
Lightly oil the griddle.
Place lamb chops on the griddle and cook for about 4-5 minutes per side for medium-rare, adjusting time for your preferred doneness.
Use a meat thermometer to check the internal temperature (145°F for medium-rare).
Let the chops rest for 5 minutes after removing them from the griddle.
Garnish with fresh herbs if desired.
Serve with lemon wedges for added zest.