Cut the eggplants into round slices and sprinkle with salt. Leave them to sit for 20 min.
In a tray smeared with olive oil, start arranging the veggies from the outer edges in a spiral inward. Arrange a slice of zucchini, onion, tomatoes, eggplant and pepper.
If you've got a whole lot of veggies, arrange them upright, if you've got less - arrange them leaning. Sprinkle with thyme and olive oil. Bake at 374°F (190 °C) for 40 min.
Serve the dish warm!