Clean and prepare the chicken thoroughly.
Cut potatoes, carrots, and onions into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the chicken.
Add potatoes, carrots, and onions to the chicken and stir-fry together.
Add soy sauce, sugar, minced garlic, pepper, and water. Bring to a boil.
Reduce to low heat and simmer until the sauce thickens.
When the sauce is reduced, add green onions and sesame oil and mix well.