Cut the chicken breast and tofu into bite-sized pieces.
Finely chop the onion and green onion.
Add cooking oil to a pan, then stir-fry the green onion and onion.
Add the chicken breast and stir-fry until cooked through.
Add the tofu and stir-fry together.
Add jajang sauce and mix well while stir-frying.
Add a little water and simmer to adjust the thickness.
Serve in a bowl to finish.