Combine chicken thigh pieces with salt, white pepper, soy sauce, shaoxing wine, grated garlic, grated ginger, sesame oil, and egg white in a bowl, mixing thoroughly and letting it marinate for at least 15 minutes.
Prepare the sauce by whisking together light soy sauce, orange juice, orange zest, chicken stock, brown sugar, and cornstarch until smooth, then set it aside.
Spread potato starch on a flat surface and coat each chicken piece evenly, shaking off excess starch. Spray the air fryer basket with cooking spray and arrange the chicken in a single layer. Spray the top of the chicken pieces generously.
Air fry the chicken at 350°F for 10 minutes. Flip the pieces, spray them again, then air fry at 400°F for another 8 minutes or until the chicken is cooked through, crispy, and at least 165°F internally.
Heat neutral oil in a large pan or wok over high heat. Sauté minced garlic and ginger for about 15 seconds.
Pour in the prepared sauce and stir constantly until the sauce thickens, around 1 to 2 minutes. Stir in vinegar thoroughly.
Return the fried chicken to the pan and toss it well so every piece is coated with the sauce. Finish by drizzling sesame oil on top if desired.
Serve immediately with your choice of rice and enjoy a crispy, flavorful homemade takeout-style meal.