This casserole is very easy to prepare and also delicious if reheated.

Set the oven rack in the lower third of the oven. Preheat the oven at 375°F (190 °C).
Pour half of the oil in a 7 inch x 11 inch (17 cm x 55 cm) ovenproof casserole and add half of the garlic, onion and herbes de Provence. Alternate the slices of zucchini and tomato as shown in the picture.
Top the vegetables with remaining garlic and season with salt, pepper and remaining herbes de Provence. Drizzle with remaining oil.
Bake in the oven 75 Minutes until the vegetables are tender.