Slice the two chicken breasts in half horizontally, this will help the chicken cook quicker and become super tender. Season the chicken with salt and pepper on each side.
Grease a 9x13 baking dish add 1/3 cup of pesto all over the bottom of the dish, add the chicken in, brush 2 Tbs more pesto on top of the chicken breasts. Bake for 22 minutes or until the chicken is completely cooked.
Place a slice of mozzarella cheese over each chicken breast then add the tomatoes in. Broil in your oven for 1-3 minuets or until the cheese is melty. Enjoy!