Cut the chicken breast into bite-sized pieces.
Prepare the onion, carrot, sweet potato, and green onion.
Marinate the chicken breast with chili powder, soy sauce, minced garlic, gochujang, sugar, and pepper for 10 minutes.
Heat cooking oil in a pan and stir-fry the chicken breast.
Add the prepared vegetables and stir-fry together.
When all ingredients are cooked, finish by adding sesame oil and roasted sesame seeds.