In a bowl, combine 1 cup mozzarella, mayonnaise, Parmesan, basil, salt, and pepper. Stir until well mixed.
Roll out Crescent Roll dough on a baking sheet lightly coated with non-stick cooking spray. Form dough into a 14x9" rectangle. Sprinkle crust evenly with remaining 1 cup mozzarella.
Arrange tomato slices in a single layer over crust. Spread mayonnaise mixture evenly over tomatoes.
Bake at 375° for 15-20 minutes, until top is golden brown and bubbly. Cut into squares with a pizza cutter and place on a serving platter. Serve warm.