Cut the chicken into bite-sized pieces and soak them in cold water to remove blood.
Cut potatoes, carrots, and onions into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the chicken.
When the chicken is half cooked, add potatoes and carrots and stir-fry together.
Add soy sauce, sugar, minced garlic, pepper powder, and water, then bring to a boil.
Once boiling, add onions and green onions.
Simmer over medium heat until the sauce thickens.