In a large pot melt the butter over med-low heat. Rip the marshmallows into quarters and add them to the melted butter. Let sit for a few minutes and stir until smooth. Add in the Rice Krispies and stir until all cereal is coated with marshmallow mixture. Add in Nerds and stir to evenly distribute them. Press in a thick layer, onto a buttered cookie sheet. Sprinkle with popping candy and let cool. Once cooled cut into squares.
*if pink marshmallows are not available, add a few drops of red food color to the melted marshmallow/butter mixture.