Mix together the soy sauce, baking soda, shaoxing wine, and cornstarch in a large bowl.
Add the chicken, cover and marinate for 15 minutes.
Whisk together the ingredients for the kung pow sauce until the sugar dissolves; set aside.
Heat a large skillet or work over high heat. Heat 2 tablespoons of cooking oil and then add the marinated chicken.
Fry the chicken for 3-4 minutes while occasionally stirring, until the edges are browned. Remove the chicken from the heat and set it aside.
Add the remaining 2 tablespoons of cooking oil into the same pan. Stir in the garlic, ginger, chili, diced peppers and Sichuan peppercorns and stir fry for 1 minute.
Stir the prepared sauce and pour it into the pan. Stir the sauce as it comes to a boil.
When the sauce begins to slightly thicken, add the chicken and stir to combine all of the ingredients for about 2 minutes until the chicken is evenly coated and the sauce has thickened.
Stir in the green onions, peanuts and sesame oil. Toss well and continue to cook for 2 minutes. Serve with steamed rice and enjoy!