Clean 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, and water.
Cover with a lid and simmer over medium heat.
When the vegetables and chicken are cooked, finish by adding pepper and green onions.