01 - In a bowl, whisk together olive oil, lemon zest, lemon juice, garlic, oregano, salt, and pepper to create the marinade.
02 - Place the spatchcocked chicken in a large dish or resealable bag. Pour the marinade over the chicken, ensuring it is well coated. Cover and refrigerate for at least 2 hours, or overnight for best flavor.
03 - Preheat your barbecue to medium (about 375°F) for indirect cooking, or preheat your oven if roasting indoors.
04 - Remove the chicken from the marinade and let excess drip off. Discard leftover marinade.
05 - Place the chicken skin side up on the cooler side of the grill (indirect heat). Close the lid and cook for 40-45 minutes, turning once or twice, until the internal temperature reaches 165°F at the thickest part.
06 - For crispy skin, finish the chicken skin side down over direct heat for 2-3 minutes until golden and lightly charred.
07 - Transfer to a cutting board, tent loosely with foil, and rest for 10 minutes before carving.
08 - Serve with lemon wedges and fresh oregano sprigs.