01 -
Preheat your oven to 350 degrees F (175 degrees C).
02 -
In a large skillet over medium-high heat, cook the ground beef until it's browned and crumbly, about 5 to 7 minutes. Drain off the excess grease and set aside.
03 -
In a medium bowl, combine the condensed cream of mushroom soup, milk, chopped onion, salt, and pepper.
04 -
In a 2-quart baking dish, create alternating layers of thinly sliced potatoes, the soup mixture, and the browned ground beef.
05 -
Place the dish in the preheated oven and bake until the potatoes are tender, which should take about 1 to 1 1/2 hours.
06 -
Sprinkle the shredded Cheddar cheese over the top and return to the oven. Continue baking just until the cheese has melted and is bubbly.