Cut the chicken breast into bite-sized pieces.
Dice the tofu into cubes.
Finely chop the onion and green onion.
Add oil to a pan and stir-fry the chicken breast.
When the chicken breast is cooked, add the onion and stir-fry.
Add the tofu and stir-fry together.
Season with gochujang and soy sauce.
Add the green onion and stir-fry once more.