Preheat your oven to 400°F (200°C).
In a mixing bowl, combine the BBQ sauce, brown sugar, olive oil, garlic powder, onion powder, smoked paprika, salt, and pepper. Stir until well combined.
Pat the chicken thighs dry with paper towels to ensure a nice caramelization during cooking.
Place the chicken thighs in the baking dish, skin side up. Pour the BBQ sauce mixture over the chicken, making sure each piece is fully coated.
Bake the chicken in the preheated oven for 25 minutes uncovered.
After 25 minutes, check the chicken for doneness. If using a meat thermometer, ensure it reads 165°F (75°C). If not fully cooked, cover the dish with aluminum foil and bake for an additional 10-15 minutes, checking periodically.
During the last 5-10 minutes of cooking, turn on the broiler to caramelize the top. Keep a close eye on the chicken to prevent burning.
Once caramelized and cooked through, remove the chicken from the oven and let it rest for about 5 minutes before serving.
Garnish with fresh parsley if desired, and serve with your favorite sides.