Place Reese's in freezer for to minutes to harden.
Add cocoa powder to sweetened condensed milk ans stir until dissolved.
Heat peanut butter in microwave for 20 seconds to melt, then stir and set aside to cool.
In a large bowl, whisk heavy cream until soft peaks form.
Fold in condensed milk mixture until blended.
Unwrap and cut candies in quarters.
Fold 2/3 of the candy into the mixture.
Spread 1/3 of this mixture into a loaf pan then drizzle with melted peanut butter.
Repeat this for two more layers.
Take a knife and run through pan to swirl mixture.
Top with remaining candy pieces.
Cover with foil and freeze for 6 hours or until firm.