Mouldy desserts. Ew!
I would freeze in portions so there isn't the need to thaw and refreeze. If I did freeze the entire bag I would break off or crumble what is needed and immediately put the rest back in the freezer.
Adding to ideas above, twice baked potatoes or a version of Pioneer Woman's smashed (crash?) potatoes that have cheese melted on them at the end (the original recipe seems to have been removed from the web but there are many copycat recipes with red skinned potatoes out there).