The company have a Christmas menu on top of its regular offerings, so as well as the ubiquitous sausage roll, there's the Festive Bake, flavoured lattes and sweet mince pies.
While it doesn't actually contain edible treats inside, when you open the doors, customers will find tear-off tokens that can be exchanged for goodies from your local store.
But they came under fire after one of their publicity photographs showed a sausage roll in a manger instead of baby Jesus.
TAYLOR HERRING CONTROVERSY The baby Jesus sausage roll by Greggs has sparked fury
The offending photo appears behind one of the calendar's doors, and shows nativity figures kneeling in homage to a sausage roll in a manger. A £5 gift card sits behind the Christmas Eve door, although some calendars feature a £25 card.
A Greggs spokesperson said: "Novelty advent calendars have been around for years, so we thought it was time to take the concept up a notch".More news: Checking the Overall Picture for Delta Air Lines, Inc. (DAL)
A limited number of the calendars will go on sale in selected Greggs' shops across the United Kingdom from Monday 20th November until stocks last, priced at £24.
Other shots promoting the calendar included a Father Christmas with pasty flakes on his beard, a Greggs shop in a snow globe and a steak bake on a festive table.
Earlier this week, the bakers announced it would be selling "the ultimate Christmas gift for every Greggs fan".More news: Serena Williams to Wednesday Alexis Ohanian this week
The vouchers can be redeemed on any day in December up to and including the 24th, while the gift cards will be valid for 12 months.More news: Endo International PLC (ENDP) Releases Q3 Earnings Guidance
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