1. In a large pot over low heat, melt the butter until fully liquified.

2. Add the mini marshmallows and stir continuously until smooth and melted.

3. Remove the pot from heat and stir in vanilla extract and green gel food coloring. Mix until evenly tinted.

4. Add the crisped rice cereal and fold until fully coated with the marshmallow mixture.

5. Press the mixture into a greased or parchment-lined 9×13 inch pan. Flatten the top evenly. Let it cool for 10 minutes.

6. Cut into 12 equal rectangles once cool.

7. Melt the chocolate chips and use to pipe Frankenstein hair on the top third of each treat.

8. Add two candy eyes below the chocolate hair.

9. Pipe a stitched mouth with chocolate using a toothpick or piping bag.

10. Press one mini marshmallow onto each side of the treat for bolts.

11. Allow chocolate to set before serving or storing.