Last month, I took a Creative Baking class online with monthly.com, taught by Christina Tosi of Milk Bar. It was such a fun class (and also a lot of work!), and I ended up with three new original recipes: Popcorn & Hot Chocolate Cookies, Brûléed Maple Latte Cheesecake Pie, and this Mud Pie Cake. This is a rich, chocolatey cake that’s doused with a Kahlúa-coffee soak, layered with chocolate pudding and bits of chocolate crunch (think Oreo-like cookie crumbles), then topped with a thick layer of whipped cream. This cake is, in a word, dreamy. A New (to Me) Way to Layer a Cake In the class, we learned Christina’s…