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.
Notes
Fridge: Store leftover pesto chicken in an airtight container in the refrigerator for up to 5 days. Reheat in the microwave in 30-second intervals, or in the oven at 350 degrees Fahrenheit for 15-20 minutes until the internal temperature reaches 165 degrees Fahrenheit.
Freezer: If you prepare this as a freezer meal, leave the mozzarella out of the bag. Once the chicken has thawed completely and is ready to be baked, top with the mozzarella and bake as directed.
Make Ahead: You may assemble this dish up to 2 days in advance, just cover it tightly with plastic wrap and store it in the refrigerator. Let it sit at room temperature for 30 minutes prior to baking.