Clean and prepare the chicken thoroughly.
Cut potatoes, carrots, onions, and other vegetables into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the chicken.
Add the vegetables and stir-fry together.
Make a sauce by mixing soy sauce, sugar, minced garlic, gochujang (Korean chili paste), and pepper.
Add the sauce and mix well.
Pour in water and bring to a boil.
Simmer over medium-low heat for 20–30 minutes until all ingredients are cooked through.
Add green onions at the end and boil briefly one more time.