The traditonal "Christmas cake" is always an option, as long as you like fruit cake it is all good.
Christmas Pudding (though that is a pudding, not a dessert) this is like Christmas cake without the icing/marzipan.
"Yule Log", think swiss roll, but with coca added to the sponge and jam/cream replaced with chocolate butter icing cover in chocolate, one of my favourites.
Trifle, the king of desserts imo. Though I prefer the alcohol free ones rather than sherry variety.
Remember puddings are hot and desserts are cold