Speak to Candice and ask her to take you to Cheriweth's Confectory. It's a small instance that has the same layout as one of the houses in New Halas. Mercs can't enter.
Kill all the monsters on the first floor. They're all even con and scale to player level. Don't go downstairs until you get crumbles! Gumdrops are vvv. Gingerbread men and gingerdread men are in groups of three vv's.
Speak with Candice on the first floor.
Obtain fresh gingerbread dough from the second floor (4). It's in sacks marked with red and white sparkles.
Return to Candice in the main kitchen
Clear the monsters out of the basement. Candice sends Crumbles, a gingerbread man, with you to help. Crumbles acts as a pet, he has a few Berserker abilities and does decent melee damage.
Chase the Humbugs through the portal! Now you're suddenly on the landing south of New Halas leading down to the docks.
This article refers to events, personae and activities only present in-game during the annual Frostfell celebration. Frostfell comes to Norrath each year from (roughly) the second week of December to the first week of January.