Cut the chicken tenderloin into bite-sized pieces and season with salt and pepper.
Shred the cabbage thinly.
Julienne the carrot thinly.
Thinly slice the onion.
Heat cooking oil in a pan and stir-fry the chicken tenderloin until golden brown on both sides.
Once the chicken is cooked, add the onion and carrot and stir-fry.
Add the cabbage and stir-fry quickly over high heat.
Add soy sauce and minced garlic, and mix well while stir-frying.
Season with pepper to taste and turn off the heat.
Transfer to a plate and serve.