Creating your Easy Cheesy Vegetable Casserole with Rice is simple if you follow these easy steps:

1. Preheat your oven: Set your oven to 350°F (175°C) to prepare for baking.
2. Cook the rice: In a medium saucepan, combine the uncooked rice and vegetable broth. Bring to a boil, then reduce heat, cover, and simmer for 15-20 minutes or until the rice is tender.
3. Sauté the vegetables: In a large skillet, heat olive oil over medium heat. Add the diced onion and garlic, cooking until translucent. Then, add broccoli, bell peppers, carrots, and corn. Sauté for about 5-7 minutes until slightly softened.
4. Mix ingredients: In a large bowl, combine the cooked rice, sautéed vegetables, shredded cheddar cheese, oregano, salt, and pepper. Stir until well mixed.
5. Transfer to a baking dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Add breadcrumbs (optional): If you like a crunchy topping, sprinkle breadcrumbs over the casserole.
7. Bake: Place the dish in the preheated oven and bake for 30-40 minutes until the cheese is melted and bubbly, and the top is golden brown.
8. Cool: Remove from the oven and let it cool for about 10-15 minutes before serving. This will help the casserole set a bit.
9. Garnish: Sprinkle with fresh parsley for an added touch of flavor and color.

By following these steps, you will create a delicious Easy Cheesy Vegetable Casserole with Rice that your entire family will enjoy.