Preheat the oven to 400 degrees.
Slice zucchini, squash, potato, tomato, into thin slices
Add 1 tablespoon of olive oil in a skillet
Add 1 teaspoon of minced garlic
Sauté onion and garlic until soften
Spray the inside of an 8 x 8 square baking dish with nonstick spray
Spread the softened onion and garlic in the bottom of the dish
Place that thinly sliced vegetables in the baking dish vertically
Sprinkle with salt, pepper and thyme
Cover the dish with foil and bake for 30 minutes. Bake at 400 degrees.
Sprinkle with shredded cheese. Put back in oven for another 15 to 20 minutes