Making Cheesy Hamburger Potato Casserole is a straightforward process. Just follow these simple steps:

1. Preheat Your Oven: Set your oven to 350°F (175°C) to ensure it’s hot when the casserole is ready for baking.
2. Brown the Beef: In a skillet over medium heat, add ground beef and chopped onions. Cook until the beef is browned and the onions are soft.
3. Drain the Fat: Carefully drain any excess fat from the cooked meat and onions.
4. Combine Ingredients: In a large bowl, mix the browned beef, frozen potatoes, cheddar cheese, cream of mushroom soup, sour cream, garlic powder, paprika, milk, salt, and pepper until well combined.
5. Transfer to Casserole Dish: Pour the mixture into a greased 9×13 inch casserole dish, spreading it evenly.
6. Bake: Cover the dish with aluminum foil and bake for 30 minutes.
7. Uncover and Add Cheese: Remove the foil, sprinkle additional cheese on top if desired, and bake for an additional 10 minutes or until the cheese is bubbly and golden.
8. Cool and Garnish: Once baked, remove the casserole from the oven and let it cool for a few minutes. Garnish with fresh parsley if desired before serving.

By following these easy steps, you’ll have an incredible Cheesy Hamburger Potato Casserole ready to enjoy!