Step 1: Prepare the Potatoes. Begin by thinly slicing your potatoes evenly, aiming for approximately 1/8 to 1/4 inch thick. This ensures they cook uniformly and become wonderfully tender. For precision and ease, a quality chef's knife is highly recommended.
Step 2: Craft the Creamy Sauce. In a spacious mixing bowl, combine the cream of chicken soup, sour cream, milk, melted butter, garlic powder, onion powder, salt, and black pepper. Whisk diligently until the mixture is smooth and all ingredients are well incorporated.
Step 3: First Layer Assembly. Lightly grease the interior of your crockpot to prevent sticking. Arrange half of your thinly sliced potatoes in an even layer at the bottom. Pour half of the prepared creamy sauce over the potatoes, gently spreading it to cover. Evenly sprinkle half of both the shredded cheddar cheese and grated Parmesan cheese over the sauce.
Step 4: Second Layer and Final Topping. Place the remaining sliced potatoes over the first cheesy layer. Pour the rest of the creamy sauce mixture over these potatoes, ensuring good coverage. Finish by sprinkling the remaining shredded cheddar and grated Parmesan cheeses generously over the top.
Step 5: Slow Cook to Perfection. Securely place the lid on your crockpot. Cook on the LOW setting for 4-5 hours, or if you're in a bit more of a rush, on HIGH for 2-3 hours. The potatoes should be fork-tender, and the cheese should be beautifully melted and bubbly. Cooking times may vary slightly based on your specific slow cooker model.
Step 6: Garnish and Serve. Once the potatoes are cooked, allow them to rest in the slow cooker for a few minutes before serving. For an added touch of freshness and color, sprinkle with fresh chopped chives just before serving. Enjoy this comforting dish hot!