Pre-heat grill over high heat and pound chicken breasts until thin (about 1/2 inch thickness.)
Brush chicken breasts with olive oil using a pastry brush then sprinkle evenly with salt and pepper. Grill chicken for 5-6 minutes per side, rotating once, or until cooked through; set aside.
Pre-heat oven to 350 degrees. Pour 1 cup of the Classico® Tomato Basil sauce into the bottom of an 8x8 baking dish. Top with half of the reserved grilled chicken breasts (you may need to cut them into halves or thirds to fit in the pan.) Top the chicken with half of the shredded mozzarella and another cup of the sauce. Repeat with the remaining chicken, remaining shredded cheese and last cup of the sauce.
Top the entire pan with the sliced fresh mozzarella before placing into the oven. Bake until cheese is melted and bubbly, about 20-25 minutes. Sprinkle with fresh basil to serve.