Cut the chicken tenderloin into bite-sized pieces.
Wash the bok choy thoroughly and cut it into quarters.
Julienne the carrot and onion.
Add cooking oil to a pan and stir-fry the chicken tenderloin.
When the chicken is cooked, add the carrot and onion and stir-fry.
Add bok choy and season with salt and pepper.
When everything is evenly cooked, it's ready to serve.