In a resealable bag, crush graham crackers until coarse; pour into a brownie pan lined with parchment paper. (Leave an extra 2 inches of paper on two sides)
In a saucepan, combine butter, marshmallows and cocoa. Cook over medium heat, until melted; stir in rice cereal.
Press rice cereal mixture into crushed graham crackers into a thin layer (about ¼ inch) in the meantime, cook chocolate chips and heavy cream over a double boiler until smooth.
Remove cereal treat mixture from pan using the extra paper. Spread a layer of marshmallow spread over the surface and cut in half, the long way.
Pour a line of melted chocolate along the center of each piece, stopping ½ way before each edge.
Using the parchment paper, carefully roll each piece. Cut each roll into ¾ inch slices and serve.
