01 - Preheat the oven to 400°F. Position the rack in the center of the oven.
02 - In a large mixing bowl, combine the olive oil, ground sumac, cumin, smoked paprika, coriander, salt, and black pepper. Whisk until a smooth paste forms.
03 - Add the chicken thighs to the spice mixture and turn to coat evenly, ensuring each piece is thoroughly covered on all sides. For deeper flavor, marinate for up to 2 hours in the refrigerator.
04 - Spread the sliced carrots, drained chickpeas, red onion, and minced garlic in a roasting pan or large baking dish. Drizzle with a light coating of olive oil, sprinkle with a pinch of salt, and toss to combine.
05 - Arrange the seasoned chicken thighs skin-side up on top of the vegetable mixture in a single layer, allowing the juices to baste the vegetables during roasting.
06 - Roast in the preheated oven for 40 to 45 minutes, until the chicken skin is golden brown and crisp, the internal temperature reaches 165°F, and the carrots are fork-tender.
07 - Remove from the oven, scatter the chopped fresh parsley over the dish, and serve immediately with lemon wedges alongside rice, couscous, or warm flatbread.