In a large bowl, combine the chicken wings, egg, oyster sauce, soy sauce, garlic powder, white pepper, and oil. Mix to thoroughly coat the wings. Marinate for at least 30 minutes.
In a small bowl, whisk together the flour, cornstarch, and baking powder. Add this to the wings and toss to evenly coat.
Heat about 1 ½ inches of oil to 350°F. Deep-fry the wings in batches for 3-4 minutes until golden brown and cooked through. Transfer the wings to a wire rack to drain excess oil.
If desired, allow the wings to rest for 10 minutes, then double-fry at 400°F for extra crispiness.