Great British Bake Off favourites Selasi Gbormittah and Val Stones are returning to the tent.
Judges Prue Leith and Paul Hollywood and hosts Noel Fielding and Sandi Toksvig will be back on Channel 4 for two festive episodes.
Each episode will see four former contestants return to go head-to-head for the Star Baker crown.
The broadcaster announced that two break-out stars from series seven - Gbormittah, 31, the famously chilled out banker, and retired teacher Stones, 67, who danced while baking - will be back.
Series seven was the last one broadcast on the BBC before the show went to Channel 4.
The pair will appear in The Great Christmas Bake Off alongside fellow previous contestants Paul Jagger, 51, a prison governor from series six who is best remembered for his detailed lion bread, and Beca Lyne-Pirkis, 35, from series four.
A second show, The Great Festive Bake Off, will feature Benjamina Ebuehi and baker Rav Bansal from series seven, as well as heartthrob Rob Billington from the second series, and child welfare officer Sandy Docherty from series six.
Dates for The Great Christmas Bake Off and The Great Festive Bake Off are yet to be confirmed.