Start by gathering all your ingredients. Make sure your frozen cubed hash browns are fully thawed to ensure even cooking.
In a large mixing bowl, combine the cream of chicken soup, sour cream, melted butter, onion flakes, salt, and pepper. Mix well until everything is thoroughly combined.
Fold in the thawed hash brown potatoes into the creamy mixture until they are evenly coated.
Spray your crockpot with a non-stick cooking spray to prevent sticking. Pour half of the hash brown mixture into the bottom of the crockpot. Sprinkle a layer of shredded sharp cheddar cheese over the top.
Add the remaining hash brown mixture on top of the cheese layer. Finish with the rest of the shredded cheddar cheese on top.
Cover the crockpot with the lid and cook on low for about 6 to 8 hours, or until the potatoes are tender and the cheese is bubbly and golden.
Once cooked, stir the cheesy potatoes before serving to distribute the cheesy goodness. Serve hot as a side dish, and watch them disappear!