Cut the chicken tenderloin into bite-sized pieces.
Slice the onion, carrot, and cabbage into pieces easy to eat.
In a bowl, mix chicken tenderloin with gochujang (Korean red chili paste), soy sauce, minced garlic, red pepper powder, sugar, and black pepper.
Heat cooking oil in a pan and stir-fry the onion, carrot, and cabbage first.
Add the chicken tenderloin and stir-fry over medium heat until cooked through.
If needed, add a little water, and once all the ingredients are cooked, turn off the heat.