Do I actually need to say anything?
These are cool because you can make them in a number of different ways whether you use a mix or not.
What you need:
Graham crackers (I used a box of pre-crushed crumbs)
Dark chocolate cake mix
Make a batch of the cake mix. Seriously, I never make a whole box - that's way too many for just 2 of us - so I usually make about 1/3. In a separate bowl, blend graham crackers with melted butter (about 1 tsp per 5 crackers) which will help hold it together. Carefully melt about 1/4 bar of chocolate (nuke it for 20 seconds then stir it until it's smooth).
Put cupcake papers into a tin. Distribute about 1-2 tsp of graham mix in the bottom, then drizzle a small spoon of melted chocolate over it - this will help hold it together. Pour cake batter in until cups are 2/3 full. Bake as normal but just slightly less (2 minutes) than recommended. Remove from oven and switch oven to broiler. Place 3-4 mini marshmallows on top and place under broil until they start to turn golden. When you pop them out, drop 1-2 squares of dark chocolate on the side.