When You Can (and Can't) Substitute Mayo for Butter in Baking
by Allie Chanthorn Reinmann from Lifehacker on (#63K68)

Of all the suspicious ingredients to add to cake batter, mayonnaise is certainly at the top of the list. Known for adorning meat-laden sandwiches and turning everything from eggs to Jell-o into a salad," mayo doesn't seem like a customary ingredient for brownies, yet here we are.
Yes, baking with a scoop of...