Healthy Crab Zucchini Casserole | Low-Calorie Recipe

Ingredients

• 1 small onion, chopped
• 3 small zucchini, unpeeled and sliced
• 1 garlic clove, crushed
• 2 large tomatoes, chopped
• 1/2 lb lump crabmeat
• 1/2 cup diced reduced-fat Swiss cheese
• 1/2 cup fine Italian bread crumbs
• Black pepper to taste
• 1 tsp chopped fresh basil
• 1 Tbsp unsalted butter