I think we are the masters of a quiet Christmas.
We have a mini Christmas tree that sits on a bookshelf in the living room and is quick to put up and take down.
We buy some nice food but nothing too extravagant, things like different cheeses, olives, crackers, nuts, dates, cookies, Christmas cake and mince pies. The non refrigerated items are left out on the kitchen table over the Xmas period for people to help themselves.
Other than that, Christmas dinner is usually mid afternoon, a turkey crown, some sausages, roast potatoes, steamed brussels sprouts, carrots and brocolli, shop bought fresh gravy and cranberry sauce.
A bottle of prosecco will be enough alcohol on Xmas day for DH, DS1(now at uni) and I. We don't drink that regularly.
Christmas pudding or ice cream or cake from the selection we bought, usually later as we are full after the main meal.
Everyone gets chocolate in their stockings and can eat it when they like, we all like different types of chocolate so it works better than buying a big box.
Boxing day main meal is Xmas lunch leftovers with bread and salad.
In the evenings, we get out the board games, watch some TV, or chat.
Visits to friends/relatives happen around Xmas, but not Christmas day, we organise times to see people but don't cater for each other, apart from tea and biscuits or cake. I like to meet friends for a walk in the countryside and a coffee, healthier and cheaper than going for a meal.
Presents are simple. DS20 and 17 usually get some money if they can't think of anything they want. DH and I buy each other something we actually want, often clothes. But we don't spend a fortune. We don't buy presents for siblings or nieces/nephews, this has been agreed between us all and they do the same.
For us it's all about relaxing, having time off work/study and spending some quality time together.