Preheat the oven to 425˚F. Line a baking sheet with foil and set it aside.
Place the chicken wings, cornstarch, and baking powder in a large mixing bowl. Toss them until the chicken wings are completely coated.
Add the garlic powder, onion powder, ground paprika, cayenne pepper, and salt. Toss to combine.
Grease the lined baking sheet with half of the olive oil. Arrange the chicken wings on the baking sheet in a single layer. Drizzle the remaining olive oil over the wings.
Transfer to the oven and cook for 20 minutes. Using kitchen tongs, flip them over and continue to cook for another 20 minutes or until golden and crispy. The cooking time will depend on the size of the chicken wings.
Remove chicken wings from the oven and set them aside.
Whisk the melted butter, parsley, grated garlic, and salt in a large mixing bowl until well combined.
Add the chicken wings to the butter mixture and toss until they're completely coated.
Transfer the wings to a serving plate, top them with grated parmesan cheese, and serve.
Notes
Chicken Wings/Drumettes: All wings are placed into two categories: Drums and Flats. If you don't have a bag of chicken wings already separated at the joints (separated into drums and flats), you'll have to do it yourself.
Don't Cover the Wings: Don't cover the baking dish because that will steam the wings and keep them from getting crispy.
Use the Lower Rack: Place the baking dish/sheet on the lowest rack in the oven. This will help make the wings crispier.