In a 7x11 inch or similar baking dish, combine all of the ingredients except for the parmesan.
Bake for 20 minutes. Remove from the oven, stir and top with parmesan cheese if using.
Bake for an additional 10-15 minutes until cheese is melted and zucchini is tender and serve.
Notes
LeftoversStore leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave or in the oven at 350 F for 10 minutes until heated through. I don't recommend freezing as it will alter the texture of the zucchini.