01 - In a large mixing bowl, whisk together olive oil, lemon juice, zaatar, ground sumac, minced garlic, cumin, smoked paprika, salt, and black pepper to create a uniform marinade.
02 - Add the chicken thighs to the marinade and toss thoroughly to ensure even coating. Cover the bowl and refrigerate for a minimum of 30 minutes, up to 8 hours for enhanced flavor infusion.
03 - Preheat the grill to medium-high heat, approximately 400°F. Lightly oil the grill grates to prevent sticking.
04 - Remove the chicken thighs from the marinade, allowing excess to drip off. Grill for 6 to 8 minutes per side until fully cooked and charred, ensuring an internal temperature of 165°F.
05 - Transfer grilled chicken to a serving platter and rest for 5 minutes. Garnish with chopped parsley and serve alongside lemon wedges.