Wash chicken and dry with a paper towel. Slice chicken breasts horizontally to create 4 thinner cutlets. Season lightly with salt and fresh pepper.

Preheat the oven to 400° F. Line a baking sheet with foil or parchment for easy clean-up.

Place the chicken on the prepared baking sheet. Spread about 1 teaspoon of pesto over each piece of chicken.

Bake for 15 minutes or until chicken is no longer pink in the center. Remove from oven; top with tomatoes, mozzarella, and parmesan cheese. Bake for an additional 3 to 5 minutes or until cheese is melted.

To Grill: Grill chicken over medium flame on both sides until cooked through in the center. Lower flame, top chicken with pesto, tomatoes, and cheese, and close grill until cheese melts.