01 - Preheat the oven to 400°F. Grease a 9x13-inch baking dish with cooking spray or butter.
02 - Place the chicken breasts in the prepared baking dish. Drizzle with 1 tablespoon olive oil, then evenly sprinkle with salt, black pepper, and Italian seasoning.
03 - In a medium bowl, combine the quartered cherry tomatoes, diced red onion, minced garlic, chopped basil, balsamic vinegar, 1 tablespoon olive oil, salt, and pepper. Toss until well incorporated.
04 - Spoon the bruschetta mixture evenly over the seasoned chicken breasts, ensuring each piece is well covered.
05 - Sprinkle the shredded mozzarella and grated Parmesan cheeses evenly over the bruschetta-topped chicken.
06 - In a small bowl, mix the breadcrumbs with the melted butter until the crumbs are evenly moistened. Sprinkle this mixture uniformly over the cheese layer.
07 - Bake for 30 to 35 minutes, or until the chicken reaches an internal temperature of 165°F and the topping is golden brown and bubbly.
08 - Remove from the oven and let rest for 5 minutes. Garnish with additional fresh basil leaves before serving.