I made a tutorial a while ago with this wonderful creation:
Start by mixing a graham cracker crumb crust
(the typical butter graham crumbs and a bit of sugar).
After it is pressed into your lined muffing tins tip with your favorite chocolate cake recipe.
Bake as you would a cupcake, and top with large marshmallows.
Place under broiler until toasty and golden brown.
Swirl a large amount of Chocolate Buttercream around the toasted marshmallow.
Side view and with a bit removed. (Thanks to one of my teens!)