Step 1: Brown the Beef. In a large skillet over medium heat, add the ground beef along with the chopped onion. Cook for about 8-10 minutes until browned, stirring occasionally.

Step 2: Prepare Potatoes. Wash and slice the potatoes into thin rounds, about 1/8-inch thick.

Step 3: Layer Ingredients. In your crockpot, layer half of the sliced potatoes, then half of the cooked beef, and a sprinkle of cheddar cheese. Repeat this with remaining ingredients.

Step 4: Mix Sauce. Whisk together cream of mushroom soup, milk, garlic powder, salt, and pepper in a separate bowl. Pour over the layered ingredients in the crockpot.

Step 5: Slow Cook. Cover and cook on low for 6 to 8 hours. Check around the 6-hour mark for doneness.

Step 6: Final Touches. In the last 15 minutes, sprinkle remaining cheddar cheese on top and let it melt before serving.