Marinate chicken in 2 tsp light soy sauce, 2 tsp Shaoxing wine, 1 tsp cornstarch for 30 min - 2 hours
Toast peppercorns in dry skillet over high heat until fragrant. Finely grind 1 tbsp and combine with scallion greens. Combine the remaining whole peppercorns with the chili peppers and peanuts
Heat wok over high heat until very hot. Add chili oil. Add marinated chicken in one layer, cook for 1 minute without moving. Then stir and toss until just barely cooked through
Add peanuts, chilis, whole peppercorns. Push contents of wok to the side and add the garlic, ginger, and scallion whites in the center, stirring for 15 seconds or so
Toss entire contents of wok together and add the sauce mixture (Chianking vinegar, sugar, doubanjiang, 4 tsp Shaoxing wine, 4 tsp light soy sauce, 2 tsp cornstarch). Continue to toss until chicken is evenly coated
Stir in scallion greens and ground peppercorn, transfer to serving plate