01 -
Melt the unsalted butter in a large saucepan over low heat, stirring occasionally until fully liquid.
02 -
Add the mini marshmallows to the melted butter and stir continuously over low heat until completely melted and smooth.
03 -
Remove the saucepan from heat and stir in a few drops of gel food coloring (green, purple, or orange) until evenly distributed.
04 -
Gently fold in the Rice Krispies cereal until all pieces are thoroughly coated with the marshmallow mixture.
05 -
Transfer the mixture into a greased 23x33 cm (9x13 inch) pan, pressing firmly and evenly using a greased spatula or hands.
06 -
Allow the mixture to cool and set for 10–15 minutes at room temperature.
07 -
Cut the set mixture into desired monster shapes using cookie cutters or into squares and rectangles for simpler forms.
08 -
Decorate each piece with chocolate chips for eyes or mouths, candy eyes, and festive sprinkles to create unique Halloween monsters.