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, salt, and black pepper. Whisk until a smooth, fragrant paste forms.
03 - Add the chicken thighs to the spice mixture and turn them several times, ensuring each piece is 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, sprinkle with a pinch of salt, and toss to combine.
05 - Place the seasoned chicken thighs skin-side up on top of the vegetable and chickpea mixture, spacing them evenly so the skin crisps properly during roasting.
06 - Roast for 40 to 45 minutes, until the chicken skin is deeply golden and crisp, the internal temperature of the thickest part of the thigh reaches 165°F, and the carrots are fork-tender.
07 - Remove from the oven and let rest for 5 minutes. Scatter the chopped fresh parsley over the top and serve with lemon wedges for squeezing.