Creating Cheesy Hamburger Potato Casserole is straightforward with these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C), preparing it for the delicious casserole.
2. Cook the Beef: In a large skillet, heat olive oil over medium heat. Add ground beef and diced onion, cooking until the meat is browned and the onions are translucent.
3. Season the Meat: Stir in garlic powder, onion powder, salt, and pepper. Mix well and remove from heat.
4. Mix the Sauce: In a bowl, combine the cream of mushroom soup and milk to create a smooth sauce. Set aside.
5. Layer the Ingredients: In a greased 9×13-inch baking dish, layer half of the sliced potatoes at the bottom. Spread half of the cooked beef mixture over the potatoes, then pour half of the sauce over it. Repeat with another layer of potatoes, beef, and sauce.
6. Add Cheese: Top with the shredded cheddar cheese, ensuring even coverage over the entire casserole.
7. Cover and Bake: Cover the dish with aluminum foil and bake in the preheated oven for 45 minutes.
8. Uncover and Brown: Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbling and golden brown.
9. Cool Slightly: Once fully cooked, allow the casserole to cool for about 5-10 minutes before serving. This helps the layers set a bit more and makes serving easier.

Following these steps will guide you to create an incredible Cheesy Hamburger Potato Casserole, bursting with flavor and ready to impress!