01 - Preheat the oven to 400°F.
02 - In a large bowl, combine olive oil, lemon juice, cumin, coriander, smoked paprika, cinnamon, turmeric, cayenne (if using), garlic, salt, and pepper. Mix well to create a marinade.
03 - Add the chicken thighs to the bowl and toss to coat thoroughly. Cover and let marinate for at least 30 minutes, or refrigerate overnight for deeper flavor.
04 - Arrange the chicken thighs skin-side up on a baking sheet lined with parchment paper or foil.
05 - Roast in the preheated oven for 35 minutes, or until the skin is crispy and the chicken is cooked through (internal temperature should reach 165°F).
06 - Remove from the oven, let rest for 5 minutes, and garnish with chopped cilantro and lemon wedges.
07 - Serve hot with couscous, rice, or flatbread.