Diced Potato Casserole with Vegetables Recipe

Ingredients

• 1 pound potatoes, peeled and cubed
• 0.25 cup butter, divided
• 1 onion, chopped
• 1 pound zucchini, cut into large chunks
• 1 teaspoon herbes de Provence
• salt and ground black pepper to taste
• 1 tomato, cut into large chunks
• 1.25 cups grated Parmesan cheese
• 1 cup coarsely shredded Gruyere cheese
• 1 cup dry bread crumbs