whatever bakes one’s biscuit, phr. — Green’s Dictionary of Slang

whatever bakes one’s biscuit phr.

(US) whatever makes one happy, satisfied.

2000		C. Cook Robbers (2001) 353: Whatever bakes your biscuit [...] you wanna play family man that’s your problem.
2012		L. Tucker Winters in Bloom 129: Me: ‘“Floats your boat?” Now that's a cliché.’ You: ‘No need to be snotty. Would you prefer, “Whatever bakes your biscuit”? How about “Whatever melts your butter”’?