Preheat the oven to 375°F (190°C).
Using a sharp knife, slice a pocket into each chicken breast. Don’t cut all the way through—think pita, not open book.
Stuff each breast with mozzarella, tomatoes, and a few fresh basil leaves.
Secure the opening with toothpicks if needed. Trust me, molten cheese on your baking tray is sad cheese.
Drizzle with olive oil, and season both sides with salt and pepper.
Place in a baking dish and bake for 25-30 minutes, or until the chicken is cooked through and no longer pink in the center.
Remove toothpicks, plate the chicken, and drizzle with balsamic glaze if you’re feeling fancy.