Cut the chicken breast into bite-sized pieces.
Prepare the vegetables such as paprika, onion, and broccoli by cleaning and cutting them.
Season the chicken breast and vegetables with salt and pepper.
Heat olive oil in a pan and grill the chicken breast on both sides until golden brown.
When the chicken is halfway cooked, add the vegetables and stir-fry together.
Top with mozzarella cheese, cover the pan with a lid, and cook until the cheese is melted.