Preheat your oven to 425°F and line a large baking sheet with parchment paper, placing a wire cooling rack on top to allow for air circulation.
Pat the chicken wing segments thoroughly dry with paper towels to remove all surface moisture, which is the secret to achieving a clean, crispy skin.
In a large mixing bowl, combine the avocado oil, baking powder, smoked paprika, garlic powder, onion powder, sea salt, and black pepper.
Add the chicken wings to the bowl and toss vigorously until every piece is evenly coated in the spice and baking powder mixture.
Arrange the wings in a single layer on the wire rack, making sure they are not touching each other.
Bake for 35 to 40 minutes, flipping the wings halfway through the cooking time, until they are deep golden brown and the skin is audibly crispy.
Remove the wings from the oven and transfer them to a clean bowl, then drizzle with the sugar-free BBQ sauce and toss until well glazed.
Serve the wings immediately while hot and crispy, accompanied by the fresh celery stalks for a refreshing crunch.