01 -
Preheat oven to 190°C. Lightly grease a 23x33 cm baking dish.
02 -
In a large skillet over medium heat, cook ground beef and diced onion until beef is browned and onion is tender. Season with salt and pepper. Drain any excess fat.
03 -
In a mixing bowl, whisk together cream of mushroom soup and milk until smooth.
04 -
Arrange half of the potato slices evenly in the prepared baking dish. Top with the cooked beef and onion mixture.
05 -
Pour half of the soup and milk mixture over the beef layer.
06 -
Layer the remaining potato slices over the meat, then pour the rest of the soup mixture on top, spreading evenly.
07 -
Cover the dish tightly with aluminum foil and bake for 45–50 minutes, or until potatoes are nearly tender.
08 -
Remove the foil, sprinkle shredded cheddar cheese over the top, and bake uncovered for an additional 10–15 minutes until cheese is golden and bubbling.
09 -
Let the casserole rest for 5 minutes before slicing and serving.