Cook your chocolate cupcakes and allow them to cool completely.
Make your chocolate frosting and set aside.
Pulse your Oreos into a fine crumb and put them in a medium sized bowl.
Frost your cupcakes.
Dip your frosted cupcakes into the oreo crumbs to completely the cupcake with your "dirt".
Lay your gummy worms and your spiders on top of your dirt. And serve.
