1 cup basil pesto (store bought-I love Costcos, or homemade)
1/2 cup shredded mozzarella
Preheat oven to 350°
Spray a 9"x12" baking dish with cooking spray.
Spread 1/2 cup of the pesto on the bottom of the dish. Lay the chicken breasts on top of pesto. Spread the remaining pesto on top of the chicken.
Cover with foil and bake for 30-35 minutes, depending on the thickness of the chicken.
Remove from oven and sprinkle cheese on top of chicken. Place the dish back in the oven, uncovered, for an additional 5 minutes or until the cheese is melted and slightly browned.
Serve the chicken drizzled with the sauce that has formed in the bottom of the baking dish.