Vegetable Tian

1 T. oil
1 medium yellow onion, finely diced
1 t. minced garlic
1 medium zucchini, thinly sliced
1 medium yellow squash, thinly sliced
1 medium potato, thinly sliced
1 medium tomato, thinly sliced
1 t. thyme
1 c. shredded mozzarella cheese
salt
pepper

Preheat oven to 400. Saute onion and garlic in skillet with oil. Spray the inside of an 8x8 dish. Spread the garlic mixture in the bottom of dish. Place all vegetables on top vertically, in an alternating pattern. Sprinkle generously with salt, pepper, and thyme. Cover with foil and bake for 30 minutes, Remove the foil and top with cheese. Bake another 15-20 minutes until cheese is golden brown.