With iconic neck bolts made from pretzels and monster green hue from spray icing, these marshmallow Frankenstein cupcake toppers are alive with yummy sweetness in the the form of spooky Halloween cupcake. To make Frankenstein cupcakes, follow these steps: 1. Spray white frosting and a marshmallow with green spray icing. 2. Break a pretzel stick in half; press pieces into each side of the marshmallow to make neck bolts. ...