Tomato Zucchini Casserole

INGREDIENTS

• 1 1/2 cups grated Cheddar cheese
• 1/3 cup grated Parmesan cheese
• 1/2 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 2 cloves garlic, minced
• salt and pepper to taste
• 2 medium zucchinis, thinly sliced
• 5 plum tomatoes, thinly sliced
• 1/4 cup butter
• 2 tablespoons finely chopped onion
• 3/4 cup fine bread crumbs