Cut the mackerel and chicken breast into bite-sized pieces.
Finely chop onion, carrot, green onion, and other vegetables.
Heat cooking oil in a pan and stir-fry the mackerel and chicken breast.
Add the prepared vegetables and stir-fry together.
Add rice and stir-fry, mixing well with the other ingredients.
Season with soy sauce, salt, and pepper.
Stir-fry everything evenly until well cooked.