I make Christmas cake and Christmas pudding with my dds in the October half term . It's a tradition now so can't change even though I'm sure it's cheaper to just buy them.
I also make mincemeat at the same time as I have most of the ingredients in. That's really not worth the effort & cost but DC like making mince pies and it seems silly to buy mincemeat when I have the ingredients sitting in the cupboard.
I make spiced red cabbage as it delicious made in advance so the flavours can develop.
Made pigs in blankets one year but DH declared it a pointless task after devouring them
Might do them again this year anyway.
Always make my own cranberry sauce and sausage rolls.
I fancy making truffles/peppermint creams with the DC this year. But that's more for the experience than the end result which may be inedible after their sticky mitts have been at then.
We also make stained glass window biscuits for the tree and they do look lovely hanging up. Will do gingerbread men this year. Last couple of years I have cheated and bought the 'decorate your own' from Sainsburys 
I fancy making shortbread as well - that's easy enough right?
So what do you think is worth the cost/effort of making what do you think you are better off buying?