Cut the chicken breast into bite-sized pieces.
Slice the onion thinly.
Add cooking oil to a pan and stir-fry the chicken breast.
Once the chicken breast is cooked, add the onion and stir-fry together.
Add soy sauce, cooking wine, and sugar, then stir-fry until the flavors are absorbed.
Place the cooked ingredients on top of rice.
Sprinkle sesame seeds and green onions on top as desired.