01 - Pat the chicken thighs dry with paper towels to ensure even cooking and better browning.
02 - In a large bowl, whisk together olive oil, apple cider vinegar, brown sugar, smoked paprika, garlic powder, onion powder, chili powder, salt, and black pepper until well combined.
03 - Add chicken thighs to the bowl and toss thoroughly to coat with the marinade. Let marinate for at least 15 minutes, or up to 4 hours in the refrigerator for deeper flavor penetration.
04 - Preheat grill to medium-high heat or preheat oven to 400°F.
05 - Place chicken thighs skin-side down on the grill. Cook for 6–7 minutes until skin is crisp and browned. Flip and brush generously with BBQ sauce.
06 - Continue grilling for 25–30 minutes, turning and basting with additional BBQ sauce every few minutes, until internal temperature reaches 175°F and chicken is cooked through with slight charring.
07 - If using oven, place chicken thighs on a foil-lined baking sheet, skin-side up. Roast for 30–35 minutes, brushing with BBQ sauce every 10 minutes, until internal temperature reaches 175°F.
08 - Remove from heat and let chicken rest for 5 minutes to allow juices to redistribute. Serve with extra BBQ sauce on the side if desired.