Preheat the oven to 350 F and grease a 9x9 inch pan. Melt the butter in a glass bowl. Add the sugar, flour, cocoa and eggs. Stir until well combined, and then fold in the chocolate chips. Spread the batter in the pan and bake for 22-25 minutes, until a toothpick comes out clean. Cool completely.

For the peanut butter filling, add the butter, peanut butter and powdered sugar to a large mixing bowl. Use an electric mixer to combine, and spread the frosting on top of the brownie layer. Stick the pan into the fridge to cool.

To make the crispy chocolate layer, melt the dark chocolate for about one and a half minutes in the microwave. Stir in the Rice Krispies. Spread the chocolate mixture on top of the peanut butter filling and keep in the fridge for at least 2 hours before cutting and serving.