Dice the chicken thighs.
Cut potato, carrot, and onion into bite-sized pieces.
Heat cooking oil in a pan and sauté the chicken thighs until golden brown.
Add the vegetables and stir-fry together.
Add soy sauce, sugar, minced garlic, pepper, and water, then bring to a boil.
Cover and simmer on low heat for about 20 minutes.
When the sauce thickens, add green onion and mix.