01 -
Cook the ground beef and chopped onion in a skillet over medium heat until the beef is browned and no pink remains, about 5-7 minutes. Drain excess fat to avoid greasiness.
02 -
Wash and thinly slice the potatoes evenly (about 1/8 inch thick) to ensure even cooking without mushiness.
03 -
In the crockpot, layer half the potatoes first, then half the cooked beef and onion mixture, followed by a portion of shredded cheddar cheese. Repeat the layers with the remaining potatoes, beef, and some cheese.
04 -
In a bowl, whisk together the cream of mushroom soup, milk, garlic powder, salt, and pepper until smooth. Pour this evenly over the layered ingredients in the crockpot to add creaminess and moisture.
05 -
Cover and cook the casserole on low for 6 to 8 hours, or until the potatoes are tender and the cheese has melted and is bubbly.
06 -
About 15 minutes before serving, sprinkle the remaining shredded cheddar cheese on top of the casserole. Cover again to melt the cheese. Garnish with fresh parsley or chopped chives if desired before serving.