In a large bowl, combine the lemon zest, lemon juice, oil, oregano, and garlic powder. Generously season each side of the lamb chops with salt and pepper. Add to the lemon juice mixture and toss to combine. Cover and refrigerate for 1 hour. Remove from the refrigerator about 20 minutes before cooking.
Preheat an outdoor grill to medium-high. Grill the lamb chops for 3 to 4 minutes, until slightly charred on one side. Flip and cook for 2 to 3 minutes longer for medium-rare to medium doneness. Serve hot.
Recipe courtesy of Katie Lee, Endless Summer Cookbook (Stewart, Tabori & Chang / ABRAMS , May 2015)