Preheat the oven to 200c and pop a baking sheet onto the middle shelf.
While the oven is heating, butterfly the chicken breast. Put your chicken breast on a chopping board and, with your hand flat on top of it, use a sharp knife to slice into one side of the breast. Be careful not to cut all the way through to the other side. Then open it out like a butterfly.
Put the chicken on a preheated grill, or in a frying pan with some 1 calorie spray. Cook until the chicken is sealed on both sides.
Transfer the chicken breast to the pre-heated baking sheet and top with the peppers, pesto and mozzarella. Bake uncovered for 20 minutes or until the chicken is cooked through and the cheese has started to brown.
Serve with some simple salad leaves, fresh basil and tomatoes drizzled with balsamic vinegar.
Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.