01 - Preheat 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 paste forms.
03 - Add the chicken thighs to the bowl and turn them several times, ensuring each piece is thoroughly coated with the spice mixture on all sides and underneath the skin.
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 coat evenly.
05 - Place the seasoned chicken thighs skin-side up on top of the vegetable mixture in the roasting pan, spacing them apart so the skin can crisp properly.
06 - Roast for 40 to 45 minutes until the chicken skin is deep golden and the internal temperature reaches 165°F, and the carrots are fork-tender.
07 - Remove from the oven, scatter chopped fresh parsley over the top, and serve immediately with lemon wedges alongside.