Place a pan with a small amount of water in it, under the casserole dish & place in the oven. This will help the noodles from becoming dry during baking time. Very loosely, cover with foil, just to keep the noodles from drying on top. Bake for 30 minutes or until slightly bubbly. Sprinkle with Parmesan cheese; allow to sit 5-10 minutes before serving.