Cut the chicken breast into bite-sized pieces.
Slice the onion and green onion thinly.
Add cooking oil to a pan and stir-fry the chicken breast.
Add the onion and continue to stir-fry, then season with salt and pepper.
Place the stir-fried chicken breast and onion over the rice.
Drizzle with mayonnaise and soy sauce.
Finish by topping with green onion.