In a medium bowl, combine the zucchini, squash, Basil, green onion, garlic powder, ½ cup Mozzarella cheese, ½ cup Parmesan cheese, and salt/pepper to taste.
Place mixture into a greased 8 x 8 baking dish.
Bake for 30 minutes in a preheated oven, 350.
Remove pan from oven and sprinkle remaining ½ cup Mozzarella cheese on top.