Preheat oven to 400 degrees F. Place chicken breasts on a cutting board, cover with a plastic wrap and pound lightly with a meat mallet or rolling pin until even thickness.
Sprinkle each chicken breast with salt, pepper and Italian seasoning evenly on both sides.
Preheat large cast iron skillet on medium heat and swirl olive oil to coat. Add chicken breasts and cook for 3-4 minutes per side or until golden brown.
Transfer skillet with chicken to the oven and bake for 15 minutes. Remove from the oven and top each chicken breast with 2 slices of mozzarella cheese followed by tomato slices on top.
Bake for another 5 minutes and broil for a few more minutes, if you wish, to get tomatoes more wilted.
Drizzle with balsamic glaze, garnish with basil and serve hot.
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Notes
Store: Refrigerate leftovers in an airtight container for up to 3 days.Freeze: Freeze in an airtight container for up to 3 months. Thaw in the fridge overnight or on a counter for a few hours.