Cut chicken breast into bite-sized pieces.
Julienne onion and bell pepper.
Heat cooking oil in a pan and stir-fry the chicken breast.
Once the chicken is cooked, add the onion and bell pepper and stir-fry together.
Season with soy sauce, sugar, and pepper.
Place the stir-fried ingredients on top of rice.
Sprinkle sesame seeds and green onions as desired.