Bake cake according to directions on the box, let cool
Once cake is cooled, poke holes all over the cake using the handle of a serving spoon or large skewer.
Spoon marshmallow cream into a medium sized mircowave safe bowl and heat for 10 seconds at a time, stirring well after each heating cycle, until the cream is runny. This will make it spread and run down into each hole.
Spread marshmallow cream over the top of the cake.
Sprinkle graham crackers over top of the marshmallow cream.
Top with mini marshmallows and mini chocolate chips.