In a deep casserole dish place a thin layer of tomato sauce. Then make multiple layers of 1) eggplant, 2) tomato sauce 3) sprinkled Parmesan cheese, and 4) sprinkled mozzarella cheese, until all the eggplant is used.
Bake at 350 degrees for 30 minutes uncovered and 10 minutes covered with foil or casserole lid if available. Cool for 5 to 10 minutes, slice and serve hot.