Cake made with Protein Powder...?

Hi, okay so my friend's birthday is coming up, but he is a weight lifter, extreme exerciser. Yet, he still loves sweets. And, I know that on his birthday he is too strong willed to succumb to cake, but I know he'll crave it.

So, my birthday present to him is going to be to make him a protein loaded cake. Does anyone know of any recipes where I use like Muscle Milk Protein Powder, or any other type of protein powder, and just add some eggs or something and make a cake? I understand it's not going to taste as great as the bakery kinds...but at least he'll have some sort of cake on his birthday?

Oh, and the recipe cannot have dairy or butter. Not my rules, his, lol.

But please, like this way he can eat the cake instead of having a protein shake or bar during the day, I really think he would like this.

I NEED HELP!!!

PLEASE AND MANY THANKSSS!!!