Cut the chicken breast into bite-sized pieces.
Evenly coat the chicken breast with potato starch.
Pour some cooking oil into a pan and heat over medium heat.
Add the chicken breast and fry until the outside is crispy.
Place the fried chicken breast on a paper towel to drain excess oil.
Add minced garlic and chili to the pan and sauté briefly, then add the chicken breast and stir-fry together.
Season with soy sauce, sugar, and pepper.
Transfer to a plate and serve.