Preheat your oven to 425°F and line a baking sheet with a wire cooling rack to allow air circulation.
Pat the chicken wings thoroughly dry with paper towels to remove all moisture for the best texture.
In a large mixing bowl, combine the baking powder, smoked paprika, garlic powder, onion powder, salt, and pepper.
Add the wings to the bowl and toss vigorously until each wing is evenly coated with the dry spice mixture.
Place the wings on the wire rack in a single layer, making sure they do not touch each other.
Bake for 35 to 40 minutes, flipping once halfway through, until the skin is deeply golden and very crispy.
Transfer the hot wings to a clean bowl, drizzle with the sugar-free BBQ sauce, and toss until well glazed.
Serve the wings immediately alongside the fresh celery sticks for a cool, refreshing contrast.