Grease a 9x13 inch pan. Melt the butter in a large pot over medium heat. Stir in the sweetened condensed milk and let it bubble gently for about 30 seconds.
Add a splash of vanilla and a pinch of sea salt. Pour in the marshmallows and stir continuously until melted and smooth. Add in green food coloring until desired color is reached.
Remove from heat and stir in Rice Krispies until well coated. If using mini marshmallows, add them now. Pour mixture into the greased pan and press down evenly.
Let set for a few minutes. Melt chocolate chips with coconut oil in a microwave-safe bowl. Pour about ¼ cup into a zip-top bag and set aside.
Cut treats into 16 bars. Dip one end of each bar into melted chocolate for Frankenstein's hair, then place on wax paper.
Pipe chocolate dots for eyes and press on edible googly eyes. Use the chocolate bag to pipe a stitched smile and eyebrows.
Let cool completely before serving or storing.
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Notes
These treats are perfect for Halloween parties and can be made in advance!