Creating the Beef and Potato Casserole is simple when you follow these clear steps:

1. Preheat Your Oven: Set your oven to 375°F (190°C) to begin preheating.
2. Cook the Beef: In a large skillet, heat olive oil over medium heat. Add the chopped onion and minced garlic, sautéing until softened. Add the ground beef and cook until browned. Drain excess fat. Season with salt, pepper, and paprika.
3. Prepare the Sauce: In a separate bowl, combine the cream of mushroom soup and milk. Mix until smooth.
4. Layer the Ingredients: In a 9×13-inch baking dish, layer half of the sliced potatoes. Top with half of the cooked beef mixture. Pour half of the soup mixture over it. Repeat the layers with remaining ingredients.
5. Add Cheese: Sprinkle the shredded cheddar cheese evenly over the top of the casserole.
6. Cover and Bake: Cover the baking dish with aluminum foil and place in the preheated oven. Bake for 40 minutes.
7. Remove Foil and Cook: After 40 minutes, remove the foil and continue to bake for another 15-20 minutes or until the potatoes are tender and the cheese is bubbly and golden.
8. Cool: Once cooked, take the casserole out of the oven and let it cool for about 10 minutes.
9. Garnish: Before serving, sprinkle fresh parsley on top for added flavor and presentation.

Follow these straightforward steps to create a delicious Beef and Potato Casserole that will surely be a hit!