Preheat your oven to 425 degrees Fahrenheit (220 degrees Celsius). Line a large baking sheet with foil for easy cleanup, then place a wire rack on top of the foil.
Pat the chicken wings completely dry using paper towels. This step is critical for crispiness.
In a large bowl, combine the baking powder, salt, pepper, garlic powder, and cayenne pepper.
Add the dried wings to the bowl and toss them thoroughly until every piece is lightly and evenly coated with the dry mixture.
Place the coated wings on the wire rack in a single layer, ensuring there is space between each piece for air circulation.
Bake for 20 minutes.
Flip the wings over. Reduce the oven temperature to 400 degrees Fahrenheit (200 degrees Celsius).
Bake for another 20 to 25 minutes, or until the wings are deep golden brown and very crispy.
Remove from the oven. If you want extra crispiness or char, switch the oven to broil for 1 to 2 minutes, watching constantly to prevent burning.
Toss immediately with your favorite sauce, or serve dry with a side of dipping sauce.
Notes
Using a wire rack allows air to circulate underneath the wings, which prevents the bottoms from steaming and getting soggy.
Do not skip drying the wings; excess moisture prevents the skin from crisping.
Baking powder reacts with the chicken skin to raise the pH level, which helps the skin dry out and crisp up during baking.
If you plan to sauce the wings, toss them in the sauce right before serving to maintain the crunch.