Slice eggplant, zucchini, tomato, and onion thinly.
Heat olive oil in a pan and sauté minced garlic and onion.
Add tomato sauce to the pan and bring to a simmer.
Spread the sauce evenly on the bottom of an oven-safe dish.
Arrange the prepared vegetables in overlapping layers on top of the sauce.
Sprinkle with salt, pepper, and herbs.
Cover with aluminum foil and bake in a preheated oven at 180°C (356°F) for 30 minutes.
Remove the foil and bake for an additional 10 minutes.