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 the olive oil, ground sumac, cumin, smoked paprika, coriander, kosher salt, and black pepper. Whisk until a smooth, fragrant paste forms.
03 - Add the chicken thighs to the spice mixture, turning and massaging each piece until thoroughly and evenly coated on all sides.
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 additional olive oil, season with a pinch of salt, and toss to combine evenly.
05 - Lay the seasoned chicken thighs skin-side up on top of the vegetable mixture in a single even layer, allowing the juices to baste the vegetables as they roast.
06 - Roast for 40 to 45 minutes until the chicken skin is deeply golden and crisp, the internal temperature of the thickest part reaches 165°F, and the carrots are fork-tender.
07 - Remove from the oven, scatter the chopped fresh parsley over the top, and serve immediately with lemon wedges alongside.