In a double boiler, melt one tablespoon of the cocoa butter until it's completely liquid.
Add in the peanut butter and rice syrup (add more, if you want it sweeter) and stir until the ingredients are incorporated entirely.
Fill the peanut butter chocolate mixture in a chocolate mold.
Clean the double boiler and heat the remaining 1/2 tablespoon of the cocoa butter until liquid.
Add in the cocoa powder and stir again until there are no lumps in the chocolate mixture. (You can add in rice syrup here as well but I liked my chocolate swirls unsweetened).
Pour the dark chocolate over the peanut butter chocolate and make swirls with a little wooden skewer.
Place the chocolate in the fridge for about 2-3 hours. Enjoy!
Notes
It's best to leave the Peanut Butter Chocolate in the fridge for storage, because it melts easier than regular chocolate.