Combine sauce ingredients and set aside.
Combine the chicken, cornstarch, and Mirin - or - Saoxing wine, salt and pepper in a bowl,stir to combine. Pop in the fridge and marinate for a min 30 minutes. You can also add a splash of dark soy to the marinade for more flavor if you desire.
In a large wok or pan, toast the peanuts until desired toastiness. Set aside.
Add 2 tablespoons cooking oil to a hot wok/pan and heat a few moments, then add the chicken, being careful to not add the liquid from it to the pan. Cook the chicken until done and lightly browned. You may need to do it in batches, depending on the size of your pan. Remove from the pan and set aside in a clean bowl.
Add a few teaspoons of cooking oil to the hot wok/pan, add bell peppers and onions and stir fry until desired tenderness. Add garlic and saute a few minutes, be careful not to burn the garlic. Add chile pepper pods and give a good stir.*Optional - cook the carrots with the peppers and onions, if desired. Add the cooked chicken to the pan and give it a good stir to combine everything. Add in the sauce and stir well. The sauce will thicken a bit as it cooks. But if you want it thicker feel free to mix 1 Tbs of reserved sauce with 2 tsp cornstarch and drizzle over the pan and stir to combine. Cook until desired thickness. Add in a good handful (about½ C) green onions and however many toasted peanuts you desire and stir.
Garnish with more chopped green onions and peanuts. Serve over steamed rice.