Brine the chicken: Brine the chicken breast in salted water.
Cut into cutlets: Cut the brined chicken into smaller cutlets.
Prepare the marinade: Marinate the chicken with oyster sauce, light soy sauce, cooking wine, sugar, salt, white pepper, cornstarch, water, and ginger. Mix well by hand.
Cut aromatics: Cut white and red onions into strips.
Make the sauce: Combine oyster sauce, light soy sauce, sugar, chicken buan powder, cornstarch, and water for the sauce.
Coat the chicken: Lightly coat each piece of chicken in cornstarch.
Cook the chicken: Heat a stainless steel pan on high, add oil, and brown the chicken on one side before flipping.
Add onions and wine: Add most of the onions and splash in a bit of cooking wine, then cover.
Add the sauce: Pour in the sauce and mix.
Final touches: Add some sesame oil and the rest of the onions, then complete.