01 - Preheat your oven to 400°F. Lightly grease a baking dish with olive oil.
02 - Place chicken breasts in the prepared dish. Season both sides generously with salt and black pepper.
03 - Spread a tablespoon of pesto evenly over the top of each chicken breast.
04 - Arrange tomato slices over the pesto-coated chicken, distributing evenly across all pieces.
05 - Top each breast with fresh mozzarella slices. Sprinkle grated Parmesan cheese over the top if using.
06 - Drizzle the remaining olive oil over the entire dish.
07 - Bake for 25-30 minutes until chicken reaches an internal temperature of 165°F and cheese is golden and bubbly.
08 - Remove from oven and let rest for 2-3 minutes. Garnish with fresh basil leaves before serving hot.