Creating this amazing Vegetable Casserole requires simple steps to ensure success. Follow these instructions closely:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease a casserole dish with olive oil.
2. Prepare the Vegetables: Chop the broccoli, cauliflower, bell pepper, onion, carrots, green beans, and garlic.
3. Mix Vegetables: In a large bowl, combine all chopped vegetables and corn. Set aside.
4. Combine Ingredients: In another bowl, whisk together cream of mushroom soup, milk, eggs, oregano, salt, and pepper until well blended.
5. Combine Mixtures: Pour the soup mixture over the prepared vegetables, stirring until all vegetables are well coated.
6. Transfer to Dish: Pour the vegetable mixture into the greased casserole dish and spread evenly.
7. Add Topping: Sprinkle shredded cheese on top of the vegetable mixture, then evenly spread breadcrumbs over the cheese.
8. Bake: Place the casserole in the preheated oven and bake for 30–35 minutes or until the top is golden brown and bubbly.
9. Cool Slightly: Once baked, remove from the oven and let it cool for around 5–10 minutes before serving.

Following these steps carefully will lead you to create a fantastic Vegetable Casserole, sure to delight everyone at your table!