1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with butter or cooking spray.
2. In a large skillet over medium heat, cook the ground beef until browned and cooked through, about 8-10 minutes. Drain excess fat if necessary.
3. Add the chopped onion and minced garlic to the beef, cooking until the onion is translucent and fragrant, about 3-4 minutes. Season with salt, pepper, paprika, and Worcestershire sauce. Remove from heat and set aside.
4. While the beef mixture cools slightly, peel and thinly slice the potatoes. I like to use a mandoline for even slices, which helps the casserole cook uniformly and look beautiful.
5. In a small bowl, combine sour cream, milk, and a pinch of salt and pepper. Mix until smooth.
6. Layer half of the sliced potatoes in the prepared baking dish, overlapping slightly. Spread half of the beef mixture evenly over the potatoes.
7. Drizzle half of the sour cream mixture over this layer, then sprinkle with half of the shredded cheese.
8. Repeat the layers with remaining potatoes, beef, sour cream mixture, and cheese.
9. Cover the casserole with foil and bake for 40-45 minutes, or until the potatoes are tender when pierced with a fork. Remove the foil in the last 10 minutes to allow the cheese to turn golden and bubbly.
10. Let the casserole rest for about 5 minutes before serving. This helps everything set and makes it easier to slice.
11. Garnish with your favorite toppings like chopped pickles, green onions, or extra cheese for an extra punch of flavor.

One trick I swear by—after baking, I like to broil the top for just a minute or two to get that perfect bubbly, crispy cheese crust. It’s a small step but totally worth it, especially when serving guests or indulging in a special family dinner.