Preheat the oven to 350 degrees. Place black cupcake liners in 2 muffin tins. Set aside.

In a large bowl whisk together the chocolate cake mix, milk, sour cream, and oil. Mix well.

Add in the eggs and mix until combined.

Divide the batter between the muffin cups, filling each one 3/4 of the way full.

Bake for 20-23 minutes or until a toothpick inserted into the center comes out clean.

Remove from oven and cool completely on a write rack.

In a large bowl beat the butter with a mixer on medium speed until smooth.

Add the powdered sugar in a cup at a time until well combined.

Add in the milk and vanilla and beat on medium speed for 2 minutes or until fluffy.

Remove 1/2 cup of frosting from the bowl. Dye the frosting remaining in the bowl green. Dye the 1/2 cup of frosting black.

To make the cupcake put a mound of frosting on top of each cupcake and using a butter knife square off the frosting.

Place a peanut butter cup on top of the frosting. I found special Frankenstein peanut butter cups that were brown and green but the all brown ones work fine.

Place the black frosting in a piping bag with a thin tip. Pipe on a straight line for the mouth and two lines angling downward for the angry eyebrows.

Place 2 eyes into the frosting under the eyebrows. Place a chocolate chip, pointed side down, into each side of the frosting for the "bolts".