Marinate the sliced chicken with salt, sugar, and beaten egg for 5-10 minutes.
In a separate bowl, combine minced garlic, chili bean sauce, soy sauce, water, sugar, mirin, vinegar, and sesame oil to make the sauce.
Coat the marinated chicken with potato starch.
Heat oil in a pan or wok and stir-fry the peppers for a few minutes. Sprinkle salt over the peppers and continue to stir-fry for another minute. Remove them from the pan.
In the same pan, add the coated chicken slices and stir-fry until golden brown and crispy.
Pour the sauce over the chicken and add the peppers. Toss everything together.
Sprinkle sesame seeds over the dish.
Serve and enjoy with rice or noodles.