Preheat the Ninja Foodi to 375 degrees on Air Crisp.
Season the chicken by rubbing the salt, brown sugar, smoked paprika, and black pepper all over the chicken thighs.
Place the chicken thighs in the air fryer basket in a single layer and cook on Air Crisp for 10 minutes, flipping the chicken thighs halfway through cooking.
Remove the basket from the base and baste chicken with BBQ sauce on both sides. Place chicken thighs back in the air fryer and cook on Air Crisp for an additional 2 to 4 minutes.
Remove them from the air fryer and enjoy! Chicken thighs are done cooking once they reach an internal temperature of 165 degrees.