Cut the chicken breast into bite-sized pieces.
Season the chicken breast with salt and pepper.
Mix egg and starch powder to make a batter.
Coat the chicken breast pieces with the batter.
Pan-fry the chicken breast in oil until crispy.
Mix soy sauce, vinegar, erythritol, and water to make the sauce.
Simmer the sauce in the pan, add the crispy chicken breast, and toss until well coated.