Cut the chicken into bite-sized pieces.
Chop potatoes, carrots, and onions into appropriate sizes.
Add cooking oil to a pan and stir-fry the chicken.
Add potatoes, carrots, and onions and stir-fry together.
Pour in soy sauce, sugar, minced garlic, black pepper, and water, then bring to a boil.
Simmer over medium heat until the ingredients are cooked through.
Finish by adding green onions and sesame oil.