Melt the butter in a slow cooker over medium heat.
Add the marshmallows to the cooker and stir until they're coated with the butter and starting to melt.
Add a few drops of Leaf Grean Gel Paste Food Color to the marshmallows along with a few drops of Chocolate Brown. Stir well to combine and until the marshmallows are completely melted and there are no streaks of color in the mix.
Stir in the crisp rice cereal and mix well to completely combine the marshmallows with the cereal.
Turn the cooker heat to low.
Use non-stick cooking spray on hands and utensils as you mold Frankenstein's face into place on a serving platter.
Press Frank's gumball eyes in place and recess them slightly.
Continue working the warm cereal to finish Frank's features. See blog post.
Pipe the black royal icing in place to form Frank's hair and unibrow.
Pipe red stitches in desired areas on Frank's face.
Add two candies (using the royal icing as glue) to the sides of Frank's jawline as his bolts.
Allow the royal icing to lightly dry before covering.
No need for refrigeration. Will keep for up to one week.
Serve and enjoy.