"Whatever bakes your cake” means “whatever makes you happy” or “whatever’s your choice/desire” or “whatever’s your flavor” or “whatever turns you on” or “whatever floats your boat.” The silly saying is cited in print from at least 1997.
Similar food-related phrases include “Whatever melts your butter” (since 1975), “Whatever butters your biscuit” (since 1996), “Whatever tickles your pickle” (since 1998) and “Whatever sprinkles your donut” (since 2012).
YAHOO! Answers
What are other sayings like “whatever floats your boat”?
are there different variations out there?
please and thank you 
Best Answer - Chosen by Voters
whatever tickles your pickle” - though that’s a bit vulgar
“whatever bakes your cake”, etc.
Google Groups: alt.tasteless.jokes
wsgroups: alt.tasteless.jokes
From: Sven <"theexpediter"@ worldnet.att.net>
Date: 1997/05/21
Subject: Re: “What ever________”
Sup’s Girl wrote:
> like:
> What ever blows your skirt up
> What ever floats your boat
> What ever turns your crank
> more more more please
> Sup’s Girl...bakes your cake
Google Groups: alt.disney.disneyland
Newsgroups: alt.disney.disneyland
From: (Tripp1901)
Date: 1998/06/17
Subject: Re: MSEP idea
umm...whatever bakes your cake dude, just don’t be sittin’ behind me…
Google Groups; rec.motorcycles
Newsgroups: rec.motorcycles
From: (mortimer snerd)
Date: 2000/10/21
Subject: Re: Harleys really worth the $$$?
Look, get whatever ride bakes your cake, but sounding-off with misinformation makes ya look a bit silly.
Google Books
The Buzz on Travel
By Rusty Fischer and Kennerly Clay
New York, NY: Lebhar-Friedman Books
2001
Pg. ?:
Whatever bakes your cake, so long as it’s not work.
Google Groups: uk.rec.motorcycles
Newsgroups: uk.rec.motorcycles
From: “SimonK”
Date: Mon, 29 Jan 2001 22:11:44 -0000
Local: Mon, Jan 29 2001 5:11 pm
Subject: For the SETI people
It looks like you can also set it to keep a record of any interesting work units you process, if that’s what bakes your cake.
Google Groups: alt.fan.hanson
Newsgroups: alt.fan.hanson
From: (Luv Ya MTA)
Date: 13 Mar 2001 03:14:41 GMT
Local: Mon, Mar 12 2001 10:14 pm
Subject: Re: Excuse me
hmm… i think i would actually go with “my dad could beat up your dad” but…
whatever bakes your cake !
Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeyes fast food restaurant on Google Maps.
Recent entries:
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“Love everyone but hate the governments they live under” (4/1)
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“Whenever you give the government the power to disarm the mentally ill, you give the government…” (4/1)
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“Love everyone, but hate the government they live under” (4/1)
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Entry in progress—BP (4/1)
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Above, Big Apple Corner at 54th Street and Broadway in Manhattan. Google Maps.
Above, John J. Fitz Gerald, from the Aug. 15, 1931, Binghamton (NY) Press, pg. 14.
Listen to Robert Emmerich introduce "The Big Apple," a hit song from 1937. Music written by Bob and performed by Tommy Dorsey's Clambake Seven with Bob on piano. Lyrics written by Buddy Bernier and sung by Edythe Wright. Audio provided by Dorothy Emmerich.
Also listen to a 1937 "The Big Apple" song by Ozzie Nelson and his Orchestra. See a 1929 photo of John J. Fitz Gerald and a 1931 photo of John J. Fitz Gerald.
This site is edited by Barry Popik.