This cake is a labor of love, but you can make all of the individual parts ahead of time, and the finished dessert truly tastes like a bite of old-fashioned s’mores. The base is a deeply chocolatey sour cream cake that stays soft and moist for days. The cake layers are sandwiched together with toasted marshmallow buttercream and graham cracker crumbles. The sweet and salty graham crumbles, made from graham cracker crumbs that are mixed with sugar and melted butter and then baked, add crunchy texture to the cake and make a terrific garnish, too. You will need a kitchen torch to toast the meringue for the buttercream, but it’s totally worth it for that iconic, deeply caramelized marshmallow flavor.
