01 - Preheat your oven to 400°F. Lightly grease a baking dish with olive oil.
02 - Place chicken breasts in the prepared baking dish. Season both sides generously with salt and black pepper.
03 - Spread 1 tablespoon of pesto evenly over the top of each chicken breast.
04 - Arrange tomato slices over the pesto-coated chicken, distributing evenly among all pieces.
05 - Top each chicken breast with mozzarella slices. Sprinkle grated Parmesan cheese over the mozzarella if desired.
06 - Drizzle remaining olive oil over the assembled chicken. Bake for 25 to 30 minutes until chicken reaches an internal temperature of 165°F and cheese is golden and bubbly.
07 - Remove from oven and let rest for 5 minutes. Garnish with fresh basil leaves before serving.