Crush the Oreos into fine crumbs using a food processor or by placing them in a zip-lock bag and crushing with a rolling pin.

In a large pot over medium heat, melt the butter. Once melted, add the mini marshmallows, stirring continuously until completely melted and smooth.

Remove the pot from heat and add the Rice Krispies. Mix until all the cereal is coated evenly.

Place a sheet of parchment paper on a clean surface. Lightly grease your hands with cooking spray, then press half of the Rice Krispies mixture onto the parchment into a rectangular shape.

Add a layer of crushed Oreos on top of the Rice Krispies and flatten gently.

Using the parchment, carefully lift one end of the rectangle and start rolling it up tightly, like sushi. Press gently to seal the edges, then wrap the whole roll in parchment paper.

Refrigerate for about 30 minutes until firm.

After chilling, remove the roll from the fridge, unwrap it, and slice into pieces with a sharp knife. Finish with colorful slices of sour gummy stripes for an extra pop of fun.