In a medium bowl, whisk together ketchup, apple cider vinegar, brown sugar, Worcestershire sauce, smoked paprika, garlic powder, onion powder, black pepper, and olive oil to make the BBQ marinade.
Place chicken thighs in a resealable bag or shallow dish. Pour marinade over chicken, ensuring it's fully coated. Seal and refrigerate for at least 1 hour, preferably up to 4 hours.
Preheat grill to medium-high heat (about 375°F–400°F). Clean and oil the grates to prevent sticking.
Remove chicken from marinade and let excess drip off. Season lightly with salt. Grill chicken for 6–7 minutes per side, or until internal temperature reaches 165°F and the surface has nice grill marks.
Transfer cooked chicken to a plate, tent with foil, and let rest for 5 minutes before serving. Optional: brush with extra BBQ sauce during the last minute of grilling for added flavor.
Notes
Perfect for summer barbecues—serve with corn on the cob and coleslaw.