Guaranteed Crowdpleaser (For the Under-10 Set)

It's a miracle if I bake something from scratch even once during the course of my child's birthweek. And if I'm going to do it, it's going to be Rosa's Mud Cake for the actual birthday party. But for the classroom party? No chance. A few years ago I debuted this Dunkin Donut Cake at school and was actually embarrassed by how slap-it-together it was. But…