1. Cut the zucchini, yellow zucchini and tomato into thin slices. Peel the potato and cut into thin slices, soak into the salt water.
2. Peel the onion and dice. Add the minced garlic and cooking olive oil. Mix well. Place the onion garlic onto the baking tray evenly.
3. Place the zucchini slice, yellow zucchini slice, tomato slice and potato slices into one vertical row in order.
4. Pick the different color of vegetable slices into the beginning of different rows. Set 4 rows in total.
5. Season with sea salt and black pepper. Sprinkle the fresh thyme onto the vegetable slices. Sprinkle with cooking olive oil.
6. Cover with aluminum foil. Bake at 180 degrees for 30 minutes.
7. Take out. Remove the aluminum foil. Sprinkle the mozzarella cheese and cheese powder evenly. Bake again at 180 degree for around 7-10 minutes until the cheese is golden. Ready to serve.