Cut the chicken into ½-inch cubes.
In a bowl, mix with Shaoxing wine, soy sauce, salt, egg white, and cornstarch. Gently massage everything in until well-coated. Then add 1 tbsp oil to lock in moisture. Let it marinate for 10 minutes.
In a small bowl, combine all the sauce ingredients: black vinegar, sugar, light and dark soy sauce, salt to taste, and cornstarch. Stir well and set aside.
Heat 1 tbsp of oil in a wok or pan over high heat. Add the marinated chicken and stir-fry for 2–3 minutes until it changes color and is mostly cooked. Remove and set aside.
Lower the heat to medium. In the same pan, add the Sichuan peppercorns and dried chilies. Stir-fry until fragrant, about 30 seconds. Be careful not to burn them!
Add the sliced ginger, garlic, and Chinese scallion. Stir until aromatic and softened.
Return the chicken to the pan. Give the sauce another stir and pour it in. Quickly toss everything together for about 30 seconds to 1 minute, allowing the sauce to thicken and coat the chicken evenly.
Finally, toss in the roasted peanuts. Give it a final stir, then turn off the heat. Serve with a bowl of hot steamed rice.