Squash Casserole

Bahan-bahan (8 porsi)

• 1 small onion (sliced)
• 1 tablespoon butter
• 1 tablespoon olive oil
• ½ teaspoon Italian seasoning
• 2 pounds squash (yellow squash and zucchini)
• salt and pepper to taste
• ⅓ cup seasoned bread crumbs
• ¼ cup grated Parmesan cheese
• ¼ cup shredded cheddar cheese
• 2 tablespoons melted butter