Cut the chicken breast into bite-sized pieces.
Peel the chestnuts and slice them thinly.
Heat olive oil in a pan and stir-fry the chicken breast.
When the chicken is cooked, add the chestnuts and stir-fry together.
Season with salt and pepper.
Add mozzarella cheese on top, cover, and let it melt.
Once the cheese is melted, plate and serve.