A sugar-free, egg-free, dairy-free and gluten-free cake that is delicious? Yes.
The frosting I chose was the "3 ingredient coconut frosting".
GO for it!!! :) Again a recipe saved by plantains!
1 - I didn't double the recipe because it would be just too much for the week. The recipe is for 1 layer of cake, which I cut in half before adding the frosting.
2- I used pea protein of an organic and vegan brand. It is 100% pea with 80% protein (http://www.raabvitalfood.de/shop/de/bio-erbsen-protein-pulver-300g.html). If you don't have pure/100% vegan protein powder -- and please talk to a nutritionist or to your doctor before buying it -- I would say oat flour might also work, but I didn't try, can't guarantee the same results.
From Purely Twins