Pat the chicken wings completely dry with paper towels to ensure the skin becomes as crispy as possible.
In a large mixing bowl, toss the wings with the avocado oil until they are evenly and lightly coated.
In a small ramekin, whisk together the baking powder, smoked paprika, garlic powder, onion powder, cayenne pepper, sea salt, and black pepper.
Sprinkle the spice and baking powder mixture over the wings, tossing thoroughly to ensure every wing is well-coated for maximum crunch.
Arrange the wings in a single layer in the air fryer basket, ensuring they are not touching to allow for optimal air circulation.
Air fry at 400°F for 20 to 25 minutes, flipping the wings halfway through the cooking time, until the skin is golden brown and very crisp.
Transfer the hot wings to a clean bowl and toss with the sugar-free BBQ sauce until the wings are glistening and fully coated.
Serve the wings immediately while hot and crispy, accompanied by fresh celery sticks on the side.