Step 1

Butter the bottom of a 13x9 inch baking dish and line with parchment paper leaving a two inch over hand on each side. Set aside.

Step 2

In a large saucepan, melt the butter over low heat. Add the marshmallows and stir until melted. Remove from the heat and add the rice krispies. Stir the mixture until all the cereal is well coated. Pour the mixture into the prepared baking dish and press down to form an even layer. Allow to cool to room temperature.

Step 3

Pour the melted chocolate over the cool cereal layer and spread with a knife or offset spatula. Decorate with sprinkles and allow the chocolate to cool. Once the chocolate is firm, remove from the baking dish and transfer to a cutting board. Cut into 2-3 inch squares and store in an airtight container for up to 3 days.