Wash bok choy and mushrooms thoroughly and cut them into bite-sized pieces
Slice the onion and chop the green onion
Add cooking oil to a pan and stir-fry the green onion to bring out its aroma
Add the onion and mushrooms and stir-fry over medium heat
Add bok choy and season with salt and pepper
Place the stir-fried ingredients on top of the rice to finish