Fill your cupcake liners a little less than 2/3 full of batter so that they bake with flat tops. Allow the baked cupcakes to cool completely before frosting them.

Make your chocolate frosting. Add some black food coloring to make the frosting black. Frost a thin layer of black frosting on the tops of the cupcakes.

Use a small frosting tip (or a ziplock bag with a corner cut) to pipe two white circles with the white frosting, and a dot in the center.

Starting at the center dot, use a toothpick to pull a straight line out to the edge of the cupcake. Repeat around the cupcake to make a spiderweb. Stick the toy spiders on top.