01 - Preheat the oven to 400°F. Line a large baking sheet with parchment paper or lightly grease it.
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 marinade and toss thoroughly to coat on all sides. Let rest at room temperature for 10 minutes for deeper flavor penetration.
04 - Spread the carrot sticks, sliced red onion, drained chickpeas, and minced garlic evenly across the prepared baking sheet. Drizzle with a light coating of olive oil and toss to combine.
05 - Nestle the marinated chicken thighs skin-side up on top of the vegetable mixture, ensuring even spacing for proper roasting.
06 - Roast in the center of the oven for 35 to 40 minutes, until the chicken skin is deeply golden and the internal temperature registers 165°F. The vegetables should be tender and the chickpeas slightly crisp at the edges.
07 - Remove from the oven and let rest for 3 to 5 minutes. Scatter the chopped fresh parsley over the top and serve hot alongside rice, warm flatbread, or a crisp green salad.