Mayonnaise Brownies

I forgot to take a picture of my brownies so this is Hellmann's press shot instead. Mine looked exactly the same as this though, honest.

For many it seems the idea of brownies made with mayonnaise ranges from confusing to repulsive; although it of course doesn’t help if the person in question hates mayonnaise to begin with. Yet when you consider that the main two ingredients of mayonnaise are oil and egg yoke it makes perfect sense. I’ve seen these sorts of recipe before, which use mayonnaise to replace either the fat or both the fat and the eggs in baking but despite the obvious reasoning behind the substitution I’d never felt sure enough to try them. Why would you bother baking with something odd like mayonnaise when you could bake the normal way with butter or oil?