01 - Whisk apple cider vinegar, olive oil, garlic, brown sugar, soy sauce, smoked paprika, cumin, coriander, chili flakes, salt, and pepper in a large bowl.
02 - Add chicken thighs to the marinade, turning to coat evenly. Cover and refrigerate for a minimum of 1 hour (optional but recommended).
03 - Set the oven to 400°F (200°C). Remove chicken from marinade, reserving the marinade for later use.
04 - Heat an oven-safe skillet over medium-high heat. Sear chicken thighs skin side down for 4 to 5 minutes until golden brown, then flip and cook the opposite side for 2 minutes.
05 - Pour the reserved marinade over the chicken. Transfer the skillet to the oven and roast for 25 to 30 minutes, basting once or twice, until cooked through and juices run clear.
06 - Remove from oven and let rest for 5 minutes. Garnish with chopped parsley and serve with lemon wedges if desired.