Prepare the frying power, mix 4 tbsp potato starch and 4 tbsp of all purpose flour, dip the pieces of chicken in the paste first and then take the chicken piece by piece, cover them with frying power. Attention: be sure to cover the chicken with a firm frying powder, it can prevent the the chicken juice coming out. If you like the American fried chicken crust, you can also rub the outside of chicken, then later you will get a crispy American style crust.