Making Cheesy Hamburger Potato Casserole is a straightforward process. Follow these steps to ensure success:

1. Preheat your oven to 350°F (175°C) and grease a 9×13 inch baking dish.
2. Brown the ground beef: In a large skillet over medium heat, cook the ground beef and diced onion until browned. Drain any excess fat.
3. Mix wet ingredients: In a mixing bowl, combine the cream of mushroom soup and milk. Stir until smooth.
4. Layer potatoes: Spread half of the sliced potatoes evenly in the bottom of the greased baking dish.
5. Add beef mixture: Layer the cooked ground beef and onions over the potatoes.
6. Season: Sprinkle garlic powder, salt, black pepper, and paprika evenly over the meat layer.
7. Add remaining potatoes: Place the rest of the potato slices on top of the beef.
8. Pour soup mixture: Evenly pour the soup and milk mixture over the top layer of potatoes, making sure everything is covered.
9. Add cheese: Sprinkle 1 cup of shredded cheddar cheese over the top of the casserole for extra cheesiness.
10. Cover and bake: Loosely cover the dish with aluminum foil and bake for 30 minutes.
11. Uncover and continue baking: Remove the foil and bake for an additional 15 minutes until the potatoes are tender and the cheese is golden brown.
12. Garnish: Once baked, remove from the oven and let it sit for a few minutes. Optionally garnish with chopped green onions or parsley for a pop of color.