Preheat oven to 350 degrees. Line a cupcake pan with green cupcake liners.
In a large mixing bowl, add in the chocolate cake mix, water, vegetable oil, and eggs. Beat with a hand mixer on medium until incorporated.
Fill the cupcake liners ¾ full with the cake batter.
Place into the oven and bake for 15 to 20 minutes until done. Insert a toothpick and if it comes out clean or with moist crumbs, the cupcakes are done.
Let the cupcakes cool completely. Work on making the Frankenstein cupcake toppers and frosting while waiting.
Frosting
In a large mixing bowl, add in the butter, milk, vanilla, and powdered sugar. Beat on medium until the powdered sugar is incorporated.
Add in the violet gel food coloring and beat for 1 minute until the frosting is light and fluffy.
Add the frosting into a piping bag fitted with a straight tip or coupler. Set aside.
Frankenstein Cupcakes
Line a cookie sheet with wax paper. Cut rice krispies treats in half.
In a microwave-safe bowl, add the green and white candy melts and 1 teaspoon of the coconut oil. Microwave in 30-second intervals until the candy melts are completely melted and smooth.
Completely immerse each rice krispies treat into the melted candy and place gently on lined cookie sheet. Working quickly, place 2 eyes for each coated rice krispies treat. Allow to set.
Melt chocolate candy melts and remaining coconut oil in the microwave in 30-second intervals and dip the top part of your rice krispies treat in it. This will become Frankenstein’s hair. Place back on lined sheet and allow to set.
Use black icing (I just used store-bought) to draw eyebrows and mouth.
Assemble
Pipe a large mound of frosting on each cooled cupcake.
Place the Frankenstein topper in the center of the cupcake pressing down gently.
Add the black licorice on either side of Frankenstein for his bolts.