Cut the chicken into bite-sized pieces.
Cut the potatoes, carrots, and onions into easy-to-eat pieces.
Heat cooking oil in a pan and stir-fry the chicken.
When the chicken is half cooked, add the potatoes, carrots, and onions and continue stir-frying.
Add gochujang (Korean chili paste), soy sauce, sugar, and minced garlic to season.
Stir-fry over medium heat until all ingredients are cooked through.
Finish with sesame oil and black pepper.