01 - In a large mixing bowl, blend olive oil, lemon juice, zaatar, sumac, minced garlic, cumin, smoked paprika, salt, and black pepper until thoroughly combined.
02 - Add chicken thighs to the marinade and toss to coat evenly. Cover and refrigerate for at least 30 minutes, up to 8 hours for enhanced flavor.
03 - Heat the grill to medium-high (approximately 400°F). Lightly oil the grill grates to prevent sticking.
04 - Remove chicken from marinade, allowing excess to drip off. Grill each side for 6 to 8 minutes until fully cooked and charred, reaching an internal temperature of 165°F.
05 - Transfer grilled chicken to a platter and let rest for 5 minutes. Garnish with chopped parsley and serve alongside lemon wedges.