Pat wings completely dry with paper towels; place in large bowl.
Combine baking powder, garlic powder, salt, and pepper; sprinkle over wings and toss to coat evenly.
Preheat air fryer to 380°F; arrange wings in single layer, in batches if needed.
Cook 12 minutes; flip and cook another 12-13 minutes until golden brown and crispy.
Meanwhile, mix buffalo sauce and melted butter in a large bowl.
Transfer cooked wings to sauce; toss to coat completely.
Serve immediately with ranch or blue cheese dressing alongside.