Slice the eggplant and onion thinly.
Heat olive oil in a pan and sauté the eggplant and onion.
Transfer the sautéed eggplant and onion into an oven-safe dish.
Top with tomato sauce.
Add plenty of cheese on top.
Bake in a preheated oven at 200°C for 15 minutes.
Finish with parsley.