Cut chicken breast, mushrooms, and onion into bite-sized pieces.
Heat olive oil in a pan and sauté the onion.
Add the chicken breast and cook until done.
Add mushrooms and stir-fry together.
Add rinsed rice and stir-fry everything together.
Gradually add warm water or chicken stock and cook the rice.
Season with salt and pepper.
Sprinkle Parmesan cheese on top to finish.