Cut the chicken breast into bite-sized pieces.
Julienne the bell pepper and onion.
Heat olive oil in a pan and stir-fry the chicken breast.
When the chicken is cooked, add the vegetables and stir-fry together.
Season with gochujang (Korean red chili paste), red pepper powder, soy sauce, and minced garlic.
Stir-fry until all the ingredients are cooked through.