Dry chicken breast and pound chicken breasts with a meat tenderizer until it is about 1/4 inch - 1/2 inch thick.
Preheat oven to 400 degrees.
Combine cream cheese, spinach, basil, 4 oz of mozzarella, tomatoes, Italian sausage and garlic in a medium sized bowl and stir well.
Put chicken top side down and cover with stuffing (divide evenly between chicken breasts).
Roll chicken breasts up and pin closed with toothpicks.
Dip in Italian bread crumbs and cover evenly.
Place in a baking dish, seam side down.
Bake for about 30 minutes.
Sprinkle additional cheese on top of each breast (and more tomatoes if desired)
Bake for an additional 5-10 minutes until the inside of the chicken reaches 165 degrees.
Top with additional basil if desired and serve hot.