Cut the chicken breast into bite-sized pieces.
Finely chop the onion and green onion.
Heat cooking oil in a pan and cook the chicken breast over medium heat.
When the chicken is cooked, add onion and green onion, and stir-fry.
Add oyster sauce and soy sauce and mix well.
Stir-fry until all ingredients are well blended, then turn off the heat.
Serve the finished oyster sauce stir mix with your preferred dish.