
Preheat the oven to 375 degrees Fahrenheit.
Season 4 boneless skinless chicken breasts with ½ teaspoon salt and ¼ teaspoon ground black pepper.
Add ¼ cup of the ⅔ cup refrigerated basil pesto to the bottom of a greased 9 x 13-inch baking dish. Lay the chicken breasts on top of the pesto, then top them evenly with the remaining pesto.
Lay 6 ounces sliced fresh mozzarella evenly over the tops of the breasts. If using, add 1 cup cherry tomatoes to the baking dish around the chicken.
Bake for 25-30 minutes, until the thickest part of the chicken reaches 165 degrees Fahrenheit on a thermometer. Serve immediately.