01 - Preheat oven to 400°F. Position the rack in the center.
02 - In a large mixing bowl, whisk together the olive oil, ground sumac, cumin, smoked paprika, coriander, salt, black pepper, and lemon juice until well combined.
03 - Add the chicken thighs to the bowl and toss thoroughly to coat evenly. Allow to sit at room temperature for 10 minutes for deeper flavor penetration.
04 - Spread the carrot sticks, sliced red onion, drained chickpeas, and minced garlic across a large baking sheet. Drizzle with a light coating of olive oil and toss to distribute.
05 - Nestle the marinated chicken thighs skin-side up on top of the vegetable mixture on the baking sheet.
06 - Roast for 35 to 40 minutes until the chicken skin is golden brown and the internal temperature reaches 165°F. The vegetables should be tender and caramelized at the edges.
07 - Remove from the oven, scatter chopped fresh parsley over the top, and serve hot alongside rice, flatbread, or a crisp green salad.