Get your hashed browns out of the freezer and let them thaw (this makes mixing easier). In a large mixing bowl, combine hashed browns, soup, melted butter, sour cream, cheese, and onion.
in a separate bowl, combine corn flakes and the additional melted butter.
Place your potatoes into 12" dutch oven and spread them evenly. Add corn flake mixture on top (as much or as little as you like).
Cook at 350 for 1hr.
Recipe by Three Guys Outside at https://www.3guysoutside.com/2017/05/funeral-potatoes/