Mix oyster sauce, soy sauce, honey, and vinegar.
Add garlic powder and black pepper, then mix well.
Put wings in the sauce and let them sit for 30 minutes.
In another bowl, mix cornstarch, flour, and baking powder.
Beat egg with water, then mix with dry ingredients.
Heat oil in a frying pan to 350°F.
Dip wings in batter, coating them well.
Fry wings until golden and crispy.
Take them out and place them on paper towels.