01 - Preheat the oven to 425°F (220°C). Line a large sheet pan with parchment paper or aluminum foil for easy cleanup.
02 - In a large mixing bowl, whisk together harissa paste, olive oil, lemon juice, minced garlic, ground cumin, smoked paprika, kosher salt, and black pepper until fully combined.
03 - Pat chicken thighs dry with paper towels. Add them to the marinade and toss to coat thoroughly, ensuring even coverage.
04 - Add chickpeas, red onion wedges, sliced red bell pepper, and zucchini rounds to the bowl with remaining marinade. Toss gently to evenly coat all ingredients.
05 - Spread the chicken thighs skin-side up and the marinated vegetables evenly across the prepared sheet pan in a single layer.
06 - Place the pan in the preheated oven and roast for 30 to 35 minutes, or until the chicken reaches an internal temperature of 165°F (74°C) and the vegetables are tender and golden.
07 - For extra crispy skin, broil for an additional 2 to 3 minutes, watching carefully to avoid burning.
08 - Remove from the oven, sprinkle with chopped fresh cilantro or parsley, and serve immediately with lemon wedges on the side.