In a large bowl, combine the chicken, soy sauce, sherry and 1 teaspoon sugar. Marinate for 15 minutes.
In another bowl, combine 2 tablespoons soy sauce, rice vinegar, sesame oil, chicken broth, cornstarch, and 1 teaspoon sugar. Set aside.
Preheat a wok until smoking, add oil and stir fry chillies for a second. Add the chicken and cook for 2 to 3 minutes. Add the garlic, ginger and green onions. Stir fry for a minute then add the sauce. Top with peanuts and season with salt and pepper according to taste. Serve
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-gong-bao-chicken-with-peanuts/