01 - Preheat oven to 400°F. Line a large baking sheet with parchment paper if desired.
02 - In a large mixing bowl, combine olive oil, sumac, cumin, smoked paprika, coriander, salt, black pepper, and lemon juice. Whisk until well blended.
03 - Add the chicken thighs to the bowl and toss thoroughly to coat all surfaces evenly. Let rest at room temperature for 10 minutes to allow the flavors to penetrate.
04 - Spread the carrot sticks, sliced red onion, chickpeas, and minced garlic across the prepared baking sheet. Drizzle lightly with olive oil and toss to coat.
05 - Place the marinated chicken thighs skin-side up on top of the arranged vegetables, spacing them evenly.
06 - Roast for 35 to 40 minutes until the chicken skin is golden and crisp, the internal temperature reaches 165°F, and the vegetables are fork-tender.
07 - Remove from the oven, scatter chopped parsley over the top, and serve hot alongside rice, flatbread, or a fresh salad.