Creating the Cheesy Hamburger Rice Casserole is a straightforward process if you follow these simple steps:

1. Preheat the Oven: Set your oven to 350°F (175°C) to preheat while you prepare the casserole.
2. Cook the Ground Beef: In a large skillet, heat olive oil over medium heat. Add the chopped onion and cook until translucent, about 3-4 minutes. Add the ground beef, cooking until browned. Drain excess fat.
3. Add Seasonings: Stir in garlic powder, onion powder, salt, and black pepper. Mix well to incorporate flavors.
4. Combine Ingredients: In the skillet, add the uncooked rice, diced tomatoes, tomato sauce, beef broth, and frozen vegetables. Stir until well combined.
5. Transfer to Baking Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
6. Add Cheese: Sprinkle shredded cheddar cheese on top of the mixture.
7. Cover and Bake: Cover the dish with aluminum foil and place it in the preheated oven. Bake for 25 minutes.
8. Uncover and Finish Baking: Remove the foil and continue baking for an additional 15 minutes, or until the rice is tender and the cheese is bubbly and golden brown.
9. Let it Rest: Remove from the oven and allow it to cool for about 5 minutes before serving.

This methodical approach helps ensure that your Cheesy Hamburger Rice Casserole turns out deliciously every time!