Preheat oven to 350°F

Prepare a 2 quart baking dish with olive oil or cooking spray

In a pan over medium heat, sauté onion and garlic in 1 tablespoon of olive oil until soft

Layer bottom of baking dish with onion mixture

Toss sliced zucchini and squash with olive oil, salt and pepper

Combine bread crumbs, cheese and thyme in a bowl

Arrange zucchini, squash and tomatoes on top of onion mixture

Bake at 350°F for 30 minutes

Sprinkle bread crumb mixture over cooked vegetables

Bake an additional 10-15 minutes or until cheese has melted and top is browned

Serve