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