It would seem that if fandom has a designated confection, it's pie. This confection holds a prominent place of honor in the following:

Twin Peaks (specifically, cherry)
**Stargate: SG-1
Numb3rs (specifically, pi)
Pushing Daisies

And of course:

Supernatural

And let's not forget:

*Sweeney Todd (specifically, meat pies . . . but we won't go there . . . )

***Smallville (Ma Kent's apple pie)
***In the Heat of the Night

(This post made for the express purpose of using my new icon. And because I just pulled a pumpkin pie out of the oven. Btw, pumpkin pie has got to the the easiest pie on the planet to make.)

*It's strange for me to think of Sweeney Todd as actually having a fandom, since fandom isn't something I usually associate with live theater. Of course, lots of shows have very avid and active fandoms, so maybe I'm just weird like that . . .

**Added at Cheese Elf's and Not Ginger's (yes, scionofgrace, your short name is now Not Ginger) suggestion.

***Added at Just-Ruth's suggestion.