Preheat the oven: Move the oven rack to the middle position and preheat the oven to 425 degrees Fahrenheit. Line a sheet pan with aluminum foil (optional for easy clean up).
Mix the seasonings: To a small bowl, add the salt, pepper, garlic powder, onion powder, smoked paprika, chili powder, and brown sugar. Stir until well blended.
Pat the chicken thighs dry with a paper towel, then add them to a large bowl.
Drizzle the chicken with olive oil and toss until well coated.
Add the seasoning mixture to the bowl and toss the chicken thighs until each piece is evenly coated.
Bake the chicken: Lay the chicken on the sheet pan in a single layer, smooth side down. Bake for 20 minutes.
After 20 minutes, remove the chicken from the oven and brush with BBQ sauce, flip, then brush the other side with BBQ Sauce.
Return the chicken to the oven and cook for an additional 10 minutes until the BBQ sauce is bubbly and the internal temperature of the chicken has reached 165 degrees Fahrenheit.
Optional Step: Using oven mitts, position the oven rack 4 inches away from the heating element and broil the chicken for 1 to 2 minutes for extra crispy edges.