01 -
Peel and slice potatoes uniformly to approximately 6 mm thickness. Rinse in cold water to remove excess starch and pat dry thoroughly to prevent gumminess during cooking.
02 -
Melt a tablespoon of butter in a skillet over medium heat. Cook diced onions for 5 to 7 minutes until translucent and lightly golden to develop sweetness and reduce raw flavor.
03 -
Grease the slow cooker to prevent sticking. Arrange ingredients in three even layers: start with a layer of sliced potatoes, followed by shredded cheddar and a portion of sautéed onions. Repeat layers, finishing with a generous top layer of cheese for a golden crust.
04 -
In a bowl, whisk together melted butter, condensed cream of chicken soup, sour cream, garlic powder, salt, and black pepper until smooth and lump-free, ensuring a silky sauce consistency.
05 -
Pour the cream sauce evenly over the layered ingredients, allowing it to seep through. Cover and cook on low for 6 to 8 hours or high for 3 to 4 hours until potatoes are tender but retain shape.
06 -
Once fork-tender, gently stir the mixture to distribute sauce evenly. Adjust seasoning if necessary, and add garnishes like fresh parsley, green onions, or crumbled bacon prior to serving.