1In a bowl, combine the chicken thighs, soy sauce, salt, white pepper, and egg white. Add cornstarch and mix well. Marinate for 15 minutes.
2Heat 3 cups of oil in a wok to 350°F (177°C).
3Fry the marinated chicken in the hot oil until golden, about 3 minutes. Remove and set aside.
4Add 4 tablespoons of oil to the wok. Add Sichuan peppercorns, green peppercorns, dried chili peppers, ginger, garlic, and scallions. Stir-fry until aromatic, about 1 minute.
5Return the fried chicken to the wok. Stir-fry until well combined.