Cut the chicken into bite-sized pieces.
Slice vegetables such as onion, carrot, and potato.
Heat cooking oil in a pan and stir-fry the chicken.
Add the vegetables and stir-fry together.
Add seasonings like soy sauce, gochujang, and sugar, then stir-fry.
Pour in water and simmer on low heat until all ingredients are cooked through.
Add green onion and garlic, and stir-fry once more.
Transfer the finished stir-fried chicken to a plate.