Cut the chicken breast into bite-sized pieces.
Finely chop the tomato and onion.
Add olive oil to a pan and stir-fry the chicken breast.
When the chicken is cooked, add the onion and tomato and stir-fry together.
Add rice and mix all ingredients well.
Season with salt and pepper.
Top with cheese, cover, and let the cheese melt.
Transfer the finished rice to a bowl.