Creating the Creamy Chicken Broccoli Rice Cheese Casserole is a simple process. Follow these steps for the best results:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Casserole Dish: Lightly grease a 9×13 inch baking dish with cooking spray or butter.
3. Combine Ingredients: In a large bowl, combine the cooked rice, shredded chicken, broccoli florets, cream of chicken soup, sour cream, garlic powder, onion powder, milk, and half of the shredded cheese. Mix until well combined.
4. Season: Add salt and pepper to taste, making sure to mix well.
5. Transfer Mixture: Pour the chicken mixture into the prepared baking dish, spreading it out evenly.
6. Add Cheese and Topping: Sprinkle the remaining cheese over the top. If you wish, add breadcrumbs for extra texture.
7. Bake: Place the dish in the preheated oven and bake for 30-35 minutes or until bubbly and golden brown on top.
8. Cool Down: Once ready, remove from the oven and let it sit for 5-10 minutes to cool slightly.
9. Serve: Scoop out generous portions when serving.

By following these steps, you can create an incredible casserole that will surely delight everyone at your table.