Creating Beef and Potato Casserole can be a simple and enjoyable process if you follow these steps:

1. Preheat Oven: Set your oven to 375°F (190°C) and grease a 9×13 inch baking dish.
2. Cook Ground Beef: In a skillet over medium heat, add olive oil. Once heated, add the ground beef and chopped onion. Cook until the beef is browned and the onion is translucent. Drain any excess grease.
3. Season Beef: Stir in garlic powder, onion powder, salt, and pepper. Mix well and set aside.
4. Layer Potatoes: Spread half of the sliced potatoes evenly across the bottom of the greased baking dish.
5. Add Meat: Spoon the browned beef mixture over the layer of potatoes, spreading it evenly.
6. Add Remaining Potatoes: Layer the remaining potato slices on top of the beef.
7. Combine Soup and Milk: In a separate bowl, mix cream of mushroom soup with milk until smooth. Pour this mixture over the layered ingredients in the baking dish.
8. Add Cheese: Sprinkle the shredded cheddar cheese generously on top of the casserole.
9. Cover and Bake: Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes.
10. Remove Cover: After 30 minutes, remove the foil and continue baking for an additional 15 minutes or until the cheese is bubbly and golden brown.
11. Cool Before Serving: Once done, remove the casserole from the oven and let it cool for about 15 minutes. This will help it hold its shape when serving.

This step-by-step guide will ensure that your Beef and Potato Casserole turns out delicious every time!