Cut the chicken breast into bite-sized pieces.
Slice the onion, carrot, and green onion into easy-to-eat pieces.
Add oil to a pot and sauté minced garlic.
Add the chicken breast and stir-fry until the outside is cooked.
Add the onion and carrot and stir-fry.
Pour in water, gochujang (red chili paste), gochugaru (chili flakes), soy sauce, and sugar.
Simmer over medium heat for 15 minutes.
Add the green onion and continue to simmer until the sauce slightly thickens.