Creating this incredible Beef and Potato Casserole is straightforward when you follow these easy steps:

1. Preheat your oven to 350°F (175°C).
2. Cook the beef: In a large skillet over medium heat, add olive oil. Brown the ground beef with chopped onion until fully cooked. Drain any excess fat.
3. Season the mixture: Stir in garlic powder, onion powder, salt, and pepper. Mix well and remove from heat.
4. Mix the sauce: In a separate bowl, combine the cream of mushroom soup and milk. Stir until smooth.
5. Layer the casserole: In a greased 9×13-inch baking dish, spread half of the thinly sliced potatoes evenly on the bottom. Top with half of the beef mixture and drizzle with half of the soup mixture. Sprinkle with cheese.
6. Repeat the layers: Add the remaining potatoes, beef mixture, another layer of soup, and top with the remaining cheese.
7. Cover the dish: Tent with aluminum foil and bake in the preheated oven for 30 minutes.
8. Uncover and bake: Remove the foil and bake for an additional 20 to 30 minutes until the potatoes are tender and the cheese is bubbly and golden brown.
9. Let it cool: Allow the casserole to cool for about 10 minutes before serving. This will help the layers set.

By following these steps, you’ll achieve an incredible dish that is sure to impress.