Making Cheesy Hamburger Rice Casserole is easy if you follow these straightforward steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).

2. Cook the Beef: In a large skillet, cook the ground beef and diced onions over medium heat until the meat is browned. Drain any excess fat.

3. Add Seasoning: Stir in garlic powder, salt, and pepper, mixing well until combined.

4. Combine Ingredients: In a large bowl, combine the cooked meat mixture, uncooked rice, cream of mushroom soup, and water or beef broth. If using vegetables, add them in at this stage.

5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.

6. Add Cheese: Sprinkle 1 cup of shredded cheddar cheese over the top of the mixture.

7. Cover and Bake: Cover the dish with aluminum foil and place it in the oven. Bake for 25 minutes.

8. Remove Foil: After 25 minutes, remove the foil and bake for an additional 10 minutes, allowing the cheese to melt and become bubbly.

9. Cool and Serve: Once baked, remove the casserole from the oven and let it sit for a few minutes before serving. This will help it set and enhance the flavors.

These simple instructions will guide you to create an incredible dish that is bound to impress your family and friends!