boneless, skinless chicken breast (500 g) • large egg • cornstarch (about 16 g), more as needed • Salt, to taste • Ground black pepper, to taste • Ground garlic, to taste • soy sauce (40 ml) • Oyster sauce, to taste (optional) • ketchup (60 ml) • sugar (30 g) • white vinegar (20 ml) • water (100 ml) •