Preheat oven to 350 degrees Spray a 9x9 baking dish with non-stick cooking spray.
Add cut zucchini and squash to pan and drizzle with olive oil. Sprinkle with salt and pepper.
Combine Parmesan cheese and breadcrumbs in a small bowl. Sprinkle over the zucchini and squash.
Cover baking dish with foil and bake for about 30 minutes.
Remove foil and turn heat to a High broil. Broil until breadcrumb topping starts to turn a golden brown, about 5-7 minutes. Serve hot with fresh parsley.