Cook the ground beef and onion in a skillet over medium heat until browned, about 5-7 minutes. Drain excess fat.
Wash and slice the potatoes into 1/8-inch thick rounds.
Layer half of the sliced potatoes in the bottom of the crockpot, followed by half of the cooked beef mixture and a sprinkle of cheese. Repeat the layers.
In a bowl, whisk together the cream of mushroom soup, milk, garlic powder, salt, and pepper. Pour the mixture evenly over the layers in the crockpot.
Cover and cook on low for about 6-8 hours, until the potatoes are tender.
About 15 minutes before serving, sprinkle remaining cheese on top and cover to melt.
Garnish with fresh parsley or chives if desired, then serve hot.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.