Start by checking that the wings are split into flats and drumettes. If you have whole chicken wings, cut through the joints and remove the tips. You can save the wing tips for stock or discard them.
Place the wings on a tray or in a large bowl lined with paper towels. Pat them dry very well on all sides. This step matters more than people think. If the wings are wet, the air fryer has to dry the surface first before it can brown the skin, and that can leave you with softer wings.
If you have time, place the dried wings uncovered in the refrigerator for 30 minutes. This is not required, but it helps dry the skin even more. If you are short on time, just pat them dry properly and carry on.
Add the wings to a large mixing bowl. Drizzle over the olive oil, then add the baking powder, smoked paprika, salt, black pepper, and chili pepper.
Toss everything together with your hands or tongs until the wings are evenly covered. The seasoning should look thin and dry on the skin, not pasty. If you see clumps of baking powder, keep tossing until they disappear.
Do not add the BBQ sauce yet. BBQ sauce has sugar, and sugar can burn if it spends too long in the air fryer. The wings need to cook and crisp first, then the sauce goes on near the end.