Cut the potatoes, zucchini and mushrooms into round slices. Arrange potatoes in an oiled tray to cover the bottom. Put the zucchini and mushrooms on top.
Then arrange potatoes on top and repeat this process until out of products. Pour in 2/5 cup (100 ml) water and bake at 356°F (180 °C) for 30-40 min. until the veggies soften.
Sprinkle the grated feta cheese and cheese on top and bake another 1-2 min.
Beat the yoghurt with the dill and ground garlic, pour this over each portion when serving.