Preheat the oven to 375F
Place chicken flat in the bottom of a baking dish.
Spread 1-2 tbsp pesto on each chicken breast (the more you like pesto the more you use! I just eyeball it!)
Layer on spinach, artichokes and tomatoes.
Cover top with cheese.
Bake on lower middle rack for 30-45 minutes or until the chicken is cooled through and the juices run clear.
Serve over rice or sauteed spinach.