Line a 9x13 inch baking dish with parchment paper. Set aside.
In a large saucepan, melt butter over medium heat. Once melted, add in the marshmallows. Reduce heat to low and continue stirring until completely melted.
Remove butter and marshmallow mixture from heat, add the cereal and stir gently. Pour into the prepared baking dish. Press gently with your fingertips until completely spread out.
Allow to set for about one hour. Cut into rectangles. Decorate with frosting, candy melts, candy eyes or any other ghoulish goodies. Insert a lollipop stick or popsicle stick. Enjoy yourself or share with friends!