Cut the chicken into bite-sized pieces.
Slice cabbage, sweet potato, green onion, and onion into pieces suitable for eating.
Make the marinade with gochujang (Korean red chili paste), chili powder, soy sauce, sugar, garlic, and other ingredients.
Add the marinade to the chicken and let it marinate for 15 minutes.
Heat oil in a pan and add the marinated chicken and vegetables.
Stir-fry over medium heat until the chicken is cooked through.