01 -
Preheat oven to 350°F (175°C).
02 -
Heat olive oil or butter in a skillet over medium heat. Cook ground beef and diced onions until browned. Drain excess fat.
03 -
In a bowl, mix the cream of mushroom soup, milk, Worcestershire sauce, salt, and pepper.
04 -
In a greased baking dish, layer half of the potatoes, followed by the cooked beef mixture, then top with half the cheese. Repeat the layers.
05 -
Pour the soup mixture evenly over the casserole.
06 -
Cover with foil and bake for 45 minutes.
07 -
Remove the foil and bake for an additional 15 minutes or until the potatoes are tender and the cheese is bubbly.
08 -
Garnish with parsley, chives, or green onions if desired.