Wash the zucchini and eggplant thoroughly and slice them into 1cm thick rounds.
Lightly oil a baking tray or frying pan.
Place the sliced zucchini and eggplant on the tray or pan and season with salt and pepper.
Spread a thin layer of tomato sauce on top.
Add mozzarella cheese and your choice of toppings (corn, onion, etc.).
Bake in a preheated oven at 180°C (356°F) for 10 minutes, or cover the pan with a lid and cook until the cheese melts.
Once cooked, sprinkle with parsley or basil to finish.