Preheat the oven to 350F.

Line a large cookie sheet with cupcake papers and place an oreo in the bottom of each.

Combine all dry cupcake ingredients first. Whisk well. Add the milk and oil into the mixture and combine to form a batter.

Using a small measuring cup, pour batter into the cupcake liner on top of the Oreo cookie. Fill the cupcake liner about halfway to leave room for it to rise.

Bake at 350F for 15-20 minutes. Let cool completely once finished.

While the cupcakes are baking, prepare frosting and add in green food coloring. Keep in the fridge while the cupcakes bake and cool.

Once the cupcakes are cool, cover in green frosting.

Use candy eyeballs for the eyes on the front of the cupcake, marshmallows for Frankenstein’s ‘neck’, and chocolate chips for his hair.