Coat the wings: In a large bowl, whisk together the egg, wine, sesame oil, soy sauce, sugar, garlic powder, and pepper. Add the wings and toss to coat the chicken all over. Add 2 tablespoons of the cornstarch and the flour. Toss the wings again to coat the chicken all over. Cover and set aside for 10 to 15 minutes to bring the wings to room temperature.
Add the remaining 1 tablespoon cornstarch to the wings and toss to coat the chicken all over.
Line a plate with paper towels. Fill a large deep pot or Dutch oven halfway full with oil and set over medium-high heat. Once the oil reaches 375°F on an instant-read thermometer, fry the wings in batches of 3-4 wings to not overcrowd the pot, until golden brown and cooked through, 10 to 12 minutes.
Use tongs to remove the wings from the oil and transfer to the plate. While the wings are hot, sprinkle them with salt to taste.
Notes
Storage: Store leftovers in a sealed container in the fridge for up to 3 days. Reheat in the oven or in the microwave.