01 - Preheat the oven to 400°F. Position the rack in the center of the oven for even heat distribution.
02 - In a large mixing bowl, combine olive oil, ground sumac, cumin, smoked paprika, coriander, salt, and black pepper. Whisk until a smooth, fragrant paste forms.
03 - Add the chicken thighs to the spice mixture, turning each piece to ensure full, even coating on all sides. For deeper flavor, cover and refrigerate for up to 2 hours before roasting.
04 - Scatter the sliced carrots, drained chickpeas, red onion, and minced garlic across the bottom of a roasting pan or large baking dish. Drizzle lightly with olive oil, season with a pinch of salt, and toss to combine.
05 - Place the seasoned chicken thighs skin-side up on top of the vegetables, allowing the juices to baste the chickpeas and carrots as they cook.
06 - Roast for 40 to 45 minutes, or 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 and let rest for 5 minutes. Scatter chopped fresh parsley over the top and serve with lemon wedges alongside rice, couscous, or warm flatbread.