01 - 
                Sauté ground beef with chopped onion in a skillet over medium heat until the beef is fully browned with no pink remaining, about 5 to 7 minutes. Drain any excess fat to reduce greasiness.
              
              
              
                02 - 
                Rinse potatoes thoroughly and slice them into uniform pieces, approximately 3 millimetres thick, ensuring even cooking.
              
              
              
                03 - 
                Arrange half of the sliced potatoes at the base of the slow cooker, followed by half of the cooked beef and onion mixture and a portion of shredded cheddar cheese.
              
              
              
                04 - 
                Layer the remaining potatoes, then add the rest of the beef and onion mixture and another portion of cheddar cheese, reserving some cheese for finishing.
              
              
              
                05 - 
                In a bowl, whisk together cream of mushroom soup, milk, garlic powder, salt, and black pepper until smooth. Evenly pour this mixture over the layered ingredients in the slow cooker.
              
              
              
                06 - 
                Cover and cook on low setting for 6 to 8 hours, until the potatoes are tender and the cheese has melted and become bubbly.
              
              
              
                07 - 
                Approximately 15 minutes prior to serving, sprinkle remaining cheddar cheese over the top. Cover and allow cheese to melt. Finish with fresh parsley or chopped chives if desired.