You might never have thought to add mayonnaise to a chocolate cake but it does a wonderful job of keeping the cake moist and flavourful.
The thought if mayonnaise in a cake. It tested just as nice as any other cake - 04 Feb 2015
This cake was amazingly moist for one with no eggs or dairy. It also works well as a vanilla cake...just omit the cocoa powder. - 02 Nov 2005 (Review from Allrecipes USA and Canada)
I added 1/4 cup mayo and baked this in a bundt pan- It was wonderful! - 30 Jan 2003 (Review from Allrecipes USA and Canada)