Please disregard anything I said previously about the Marshmallow-Butter frosting being the "tastiest ever." It's not. This is.
It is Strawberry Buttercream frosting from Martha Stewart (http://www.marthastewart.com/282504/strawberry-buttercream).
The cake is just an Angel Food cake mix. I got 34 out of one box!
The frosting takes a little bit more work, but it is so worth it. YUMMM!