Cut the chicken into ½ inch cubes. Mix with marinade ingredients and let sit for 20 minutes.
Prepare Sichuan peppercorns and dried chili while waiting for chicken. Toast 1 teaspoon of peppercorn and then ground with a pestle. Prepare dried chili by slicing vertically and remove seeds.
Heat up 3 tablespoon of oil in a very hot skillet. Fry chicken. Let the chicken brown on one side, then flip.
Remove chicken from the skillet and set aside. Add whole Sichuan peppercorns and let them toast for 1 minute.
Add ginger and garlic and stir-fry for 1 minute.
Add cup of whole dried chilis and stir-fry for another minute or until the chili darken. Do not let them go black so keep watch.
Add the chicken back in with Shaoxing wine, ground Sichuan peppercorns, sugar, and scallions. Stir-fry for another minute.