Preheat the oven to 180℃ (356℉).
Slice the zucchini thinly.
Finely chop the onion and garlic.
Heat olive oil in a pan and sauté the onion and garlic.
Add the zucchini and season with salt and pepper.
Mix the roasted vegetables with cheese and bread crumbs.
Place the mixture in a heat-resistant dish and top with more cheese and bread crumbs.
Bake in the oven for 25 minutes.