It's adapted from Babycakes NYC — the recipe was developed by the genius Erin McKenna who used the strange magical powers of the soy milk powder to create a vegan frosting using agave instead of powdered sugar, which I prefer as agave doesn't give me the heart - palpitating sugar high of straight up sugar. (willfrolicforfood.com)
BUY THIS BOOK Excerpted from Babycakes Covers the Classiscs by Erin McKenna. (styleathome.com)
I can't share their full recipe because I don't want to violate any copyright laws but these are the modifications I make to the recipe in Babycakes Covers the Classics. (bulldogbistro.com)