Make the brownies according to the directions on the package and let them cool.
Carefully spread the marshmallow cream evenly on top of the brownies.
In a separate bowl, add the chocolate chips and place them in the microwave to melt. Do this slowly and start with 30 seconds. Give them a stir and then place them back into the microwave for an additional 10 seconds. Stir them again and continue that process until all the chips are melted.
Stir the peanut butter into the melted chocolate.
In a large bowl, add the Rice Krispies cereal and pour the melted chocolate and peanut butter mixture on top. Stir everything together until the Rice Krispies are completely coated.
Evenly spread the mixture over brownies.
Place them into the fridge for at least two hours to set.
Finally, cut them into squares, serve and enjoy!