01 - Set oven temperature to 400°F. Prepare a baking dish by lining it with parchment paper or lightly greasing.
02 - Using a sharp knife, carefully cut a pocket into the side of each chicken breast, ensuring not to slice all the way through.
03 - Drizzle chicken breasts with olive oil. Season both sides evenly with salt, black pepper, and dried Italian herbs.
04 - Insert 2 to 3 slices of fresh mozzarella, 2 to 3 tomato slices, and 3 basil leaves into each chicken breast pocket. Use toothpicks to secure if needed.
05 - Place the stuffed chicken breasts evenly in the prepared baking dish.
06 - Bake in the preheated oven for 25 to 30 minutes, or until the internal temperature reaches 165°F and cheese is melted.
07 - Let chicken rest for 5 minutes after baking. Drizzle with balsamic glaze and sprinkle freshly cracked black pepper before serving.