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

Preheat the oven to 400°F. Line 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 the chicken is no longer pink in the center. Remove from oven; top with tomatoes, mozzarella, and parmesan cheese. Bake an additional 3 to 5 minutes until cheese is melted.

For grilling: Grill chicken over medium flame until cooked through. Top with pesto, tomatoes, and cheese, then close the grill until cheese melts.