Lightly grease the slow cooker, then add the hash brown mixture, spreading evenly.
Place the lid on the slow cooker and cook on HIGH for 3 1/2 hours or LOW for 6-7 hours. Stir halfway through to ensure even cooking, if possible.
When the potatoes are just finished cooking, melt 4 tablespoons of butter in a skillet set over medium heat. Add the cornflakes and stir for about 2-4 minutes, until lightly toasted. Sprinkle on top of potatoes. Top with chives or green onions/scallions if using, and serve.
4 tablespoons unsalted butter, 2 cups crushed corn flakes, Fresh chives or green onions/scallions
Notes
You can use fresh or frozen hash browns. If frozen, make sure they’re not one big block of hash browns and can easily be broken up. If they’re frozen together, allow them to thaw enough that they can be separated.