Just a quick search of MR turns up a handful,
https://www.mobileread.com/forums/sea...archid=1377016 Dunno which you might consider must-reads. Perhaps googling 'Best christmas novels' might come up with some interesting results.
Beyond the very predictable Xmas stories I can't think of anything, I tend to be a Scrooge around Xmas. Heh....
-MJ