Cut the chicken breast into bite-sized pieces.
Slice onion, cabbage, sweet potato, and carrot into easy-to-eat pieces.
Mix gochujang, soy sauce, minced garlic, chili powder, and pepper to make the seasoning sauce.
Mix the cut ingredients with the sauce and let them marinate for 10 minutes.
Heat cooking oil in a pan, add the marinated ingredients, and stir-fry.
Once the ingredients are cooked, add green onion and stir-fry again.