Cut the chicken into bite-sized pieces.
Slice the onion, carrot, and green onion.
Marinate the chicken with gochujang (Korean red chili paste), soy sauce, minced garlic, red pepper powder, sugar, and pepper.
Heat oil in a pan and stir-fry the marinated chicken.
Add the vegetables and stir-fry together.
Once everything is cooked, serve it over rice.
Sprinkle sesame seeds on top if desired and serve.