Cut the chicken breast into bite-sized pieces.
Season the chicken breast with salt and pepper.
Coat the chicken evenly with potato starch.
Add plenty of cooking oil to a pan.
Pan-fry the chicken breast on both sides until golden brown, as if deep-frying.
Julienne onion, cucumber, and bell pepper.
In a bowl, mix soy sauce, vinegar, sugar, minced garlic, water, and sesame oil to make the sauce.
Place the fried chicken breast on a plate and top with the vegetables.
Pour the sauce over everything to finish.