01 -
Preheat the oven to 375°F (190°C) and grease a 9x13-inch baking dish.
02 -
In a skillet, cook the ground beef and diced onion over medium heat until browned. Season with salt and pepper. Drain any excess grease.
03 -
In a bowl, mix the cream of mushroom soup and milk until smooth.
04 -
Layer the sliced potatoes evenly in the baking dish. Spread the cooked ground beef over the potatoes. Pour the soup mixture over the beef and potatoes. Spread it evenly.
05 -
Cover the dish with aluminum foil and bake for 40 minutes.
06 -
Remove the foil, sprinkle shredded cheddar cheese on top, and bake for an additional 10-15 minutes until the cheese is melted and bubbly.
07 -
Let cool for a few minutes, garnish with parsley or chives if desired, and serve warm.