Make the peanut butter filling: In a small bowl, combine the peanut butter, oat flour, lucuma powder and maca. Roll it into a ball and set in the fridge for about 20 mins to firm up. (You can leave it longer if you don’t plan to make the cups right away.)
When ready to make the peanut butter cups, line a mini muffin tin with 12 liners. In a double boiler, melt half of the chocolate until runny. Pour this into each muffin liner, adding just enough to cover the bottom. Place the tin in the freezer for about 10 mins so the chocolate can harden.
Remove the dough from the fridge and roll it into 12 small balls. (You may have some leftover for another batch, which can be frozen if needed.) Flatten slightly, then place one in each muffin tin cavity, in the middle of the hardened chocolate disks.
Melt the remaining chocolate in the double boiler. Distribute it evenly between all of the muffin cups, covering the peanut butter balls in each one.
Refrigerate or freeze until the chocolate has fully hardened. Store leftovers in the fridge or freezer.