I got this recipe from Annie's Eats
1/2 cup bittersweet chocolate, Ghiradelli makes bittersweet chocolate chips.
4 tbsp. unsalted butter
one package of marshmallows
1 tsp. vanilla extract
6 cups Rice Krispies
20 Oreo cookies, coarsely chopped
4-6 oz. white chocolate, chopped
finely chopped Oreos, for topping
Directions: Place bittersweet chocolate in a small microwave safe bowl. Microwave in 30 second intervals, stirring in between, until completely melted. Set aside. Grease a 9×13″ pan.
Melt the butter in a large saucepan over medium heat. Add the marshmallows and stir until melted and well combined. Turn off heat and stir in the melted chocolate and the vanilla extract.
Gently stir in the Rice Krispies and coarsely chopped Oreos, and mix to coat evenly. Press the mixture into the prepared pan, leveling the top. (I like to use a piece of plastic wrap over my fingers and press it down with my hand.) Allow to cool completely.
Once cooled, cut into squares. Place white chocolate in a heatproof bowl set over a pan of simmering water, and stir until completely melted. Place the finely chopped Oreos in another bowl. Dip the top of each square into the white chocolate and then the finely chopped cookies. Set aside to cool and let the chocolate set completely.
Or spread melted whit chocolate over the top of the un-cut treats the sprinkle with cookie crumbs and lightly press down. Then cut and serve.
Store in an airtight container.