Cut the chicken breast into bite-sized pieces.
Prepare the onion and broccoli and slice them thinly.
Drizzle olive oil in a pan.
Add the chicken breast to the pan and cook over medium heat.
Add the onion and broccoli and stir-fry.
Add salt, pepper, and Jamulsik sauce, and mix evenly.
Stir-fry until all ingredients are cooked through, then plate.