Pre-heat your oven to 250 degrees. Line a baking sheet with foil and place a baking rack on top of the foil. Spray the rack with a cooking spray or brush with canola oil if you don't have spray.
Pat the wings dry (this is very important for crispy wings) and add them to a zip-top bag.
To the bag, add the baking powder, salt, and garlic powder. Close the bag and shake to coat the wings.
Place the wings on the oiled baking rack (skin side up) and place in the oven for 30 minutes.
After the 30 minutes, increase the temperature to 450 degrees. Cook for 45 minutes.