Top finished lasagna with mozzarella
Once you've added the sauce on top of the second layer of cheese, top with the remaining mozzarella slices, sprinkle with the rest of the Parmesan, cover with foil and bake at 375 for 30 minutes. Remove foil and continue baking for 15 minutes, or until cheese is bubbly. Allow to sit for at least 20 minutes before slicing.
Now sit back, relax, and gaze upon your perfect lasagna.