Prepare a 9x13 large baking pan by lining it with parchment paper.
Place butter in a large pot and set it to medium heat. Allow the butter to melt and brown. Once the butter has browned. Remove it from the heat.
Add to the dutch oven or pot your marshmallows, vanilla and desired drops of green food coloring then stir until smooth.
Add rice krispies cereal and stir. Pour the into prepared pan and gently press flat using a buttered rubber spatula.
Cut into the homemade treats into rectangles.
In a microwave safe bowl melt your chocolate in the microwave. Melt for 30 second intervals and stir to mix until smooth.
Dip the tops into melted chocolate for your hair. Place the dipped monster rice krispies treats on a piece of parchment paper to allow the chocolate to cool.
To place on the candy eyeballs, use some melted chocolate as “glue”
Place Frankenstein's "bolts" use some melted chocolate as the glue for your Rolo's
Draw on Frankenstein's smile using the same melted chocolate.
Place in the refrigerator for a couple of minutes to speed up the chocolate's drying process.