Line a baking tray with paper towels and top with an oven-proof baking rack. Lay the wings on the rack and refrigerate for at least 1 hour and up to 8 hours (the longer they sit, the crispier they will be later on).
Preheat the oven to 375 degrees F / 190 degrees C. Line another baking sheet with aluminum foil. Top with a clean baking rack sprayed with non-stick cooking spray.
Remove the wings from the fridge, and using a sharp knife, cut the wings into wingettes and drumettes. Discard the wing tips or save them for later use.
Pour baking powder, salt, pepper, onion powder and garlic powder into a large bowl or a large Ziploc bag and shake to combine.
Place half of the wings into the bag, seal and shake to coat with the baking powder mixture. Arrange the coated wings on the baking sheet and repeat the process with the remaining chicken pieces.
Spritz the tops of the wings with olive oil or cooking spray and bake for 15 minutes. Tuen over and cook for another 20-25 minutes, or until the internal temperature reaches 165 degrees F / 74 degrees C when checked with a meat thermometer. The wings should be lightly golden brown and crispy.
Serve with freshly minced parsley for garnish if desired.