Cut the chicken breast into bite-sized pieces.
Julienne the onion and bell pepper.
In a bowl, mix together gochujang, soy sauce, red pepper powder, minced garlic, and oligosaccharide to make the sauce.
Heat cooking oil in a pan and stir-fry the chicken breast.
When the chicken breast is about half cooked, add the onion and bell pepper and stir-fry together.
Add the sauce and stir-fry everything evenly so the chicken breast and vegetables are well coated.
Serve the stir-fried chicken breast mixture over rice.
Finish by sprinkling sesame seeds and chopped green onions as desired.