Preheat oven to 350 degrees F (175 degrees C). Grease a 9 inch square baking dish.
In a medium bowl, combine the squash, sour cream, cheese, onion, garlic powder, pepper, oregano, and basil. Mix until all ingredients are well blended.
Spoon mixture into prepared baking dish. In a small bowl, combine the bread crumbs and melted butter. Sprinkle over the squash mixture.
Bake in preheated oven for 30 minutes, or until top is golden brown and squash is tender.
Interesting Facts
Summer squash is a type of squash that is harvested while young, so it is tender and sweet.
Casseroles are a great way to use up leftover vegetables.
Casseroles can be easily frozen and reheated for a quick meal.