Line a 9-inch loaf pan with parchment paper.
Add the chocolate chips and creamy peanut butter to a bowl, then microwave in 30 second increments (stirring between each increment) until chocolate has melted.
Add in the crumbled rice cakes and mix everything together to combine.
Transfer the crunch bar mixture to your prepared loaf pan and spread into an even layer. Place the bars in the freezer until solid, about 1 hour, then remove and cut into squares.