01 - Pat the chicken thighs completely dry using paper towels to ensure proper seasoning adherence and crispy skin development.
02 - Whisk together olive oil, apple cider vinegar, brown sugar, smoked paprika, garlic powder, onion powder, chili powder, salt, and black pepper in a large bowl until the sugar dissolves completely.
03 - Add chicken thighs to the bowl and toss thoroughly to coat each piece evenly. Let marinate for at least 15 minutes, or refrigerate for up to 4 hours for deeper flavor penetration.
04 - Set grill to medium-high heat or preheat oven to 400°F. Ensure grates are clean and lightly oiled if grilling.
05 - Place chicken thighs skin-side down on the grill. Cook for 6–7 minutes until skin releases easily and shows grill marks. Flip and brush generously with BBQ sauce.
06 - Continue grilling for 25–30 minutes, turning and basting with additional BBQ sauce every 10 minutes, until internal temperature reaches 175°F and skin is slightly charred. For oven method, roast skin-side up on a foil-lined baking sheet for 30–35 minutes, brushing with sauce every 10 minutes.
07 - Remove from heat and let chicken rest for 5 minutes to allow juices to redistribute. Serve with extra BBQ sauce on the side.