Bake brownies as directed.

Take them out 3 minutes before they are done.

Spread a layer of marshmallows over the brownies and place them back into the oven until they are melted and slightly browned.

Wait for the brownies to cool.

Then melt chocolate and peanut butter together in microwave.

Stir in the rice krispies.

Spread the mixture over the cooled brownies.

I usually put them in the fridge to set up after that.