Pat the chicken wings completely dry with paper towels - this step is crucial for crispy skin. Place the wings in a large bowl and add the baking powder, salt, black pepper, and garlic powder. Toss well until every wing is evenly coated.
Preheat the air fryer to 380 degrees F. Arrange the wings in a single layer in the air fryer basket, making sure they are not overlapping. Work in batches if needed.
Air fry at 380 degrees F for 12 minutes, then flip each wing over. Increase the temperature to 400 degrees F and continue cooking for another 10 to 12 minutes, until the wings are golden brown and the skin is very crispy. The internal temperature should reach 165 degrees F.
While the wings finish cooking, prepare the garlic parmesan sauce. Melt the unsalted butter in a small saucepan over medium-low heat. Add the finely minced garlic and cook for about 1 minute until fragrant but not browned.
Remove the saucepan from the heat and stir in the grated parmesan cheese, fresh chopped parsley, italian seasoning, and red pepper flakes. The residual heat will melt the cheese into the butter for a rich, clingy sauce.
Transfer the crispy wings to a large bowl. Pour the garlic parmesan sauce over the wings and toss until every piece is generously coated.
Arrange the wings on a serving platter, sprinkle with extra parmesan and parsley if desired, and serve immediately while the skin is still crackling crispy.