Preheat the oven to 350 and prepare a cookie sheet with parchment paper. Set to the side.
Cream the butter with the egg until light and fluffy, about two minutes. Add in the eggs one at a time, followed by the orange juice. Scrape down the sides of the bowl as needed.
In a medium-sized bowl, sift together the potato starch, cake meal, and salt.
Add the dry ingredients to the butter mixture. Mix until fully combined. Add in chocolate chips. The batter will be very thick.
Take the prepared cookie sheet and spoon the dough onto the sheet to form 2 3-inch loaves of the mandel bread batter. Sprinkle the cinnamon and sugar on top before placing in the oven. Bake for 35-45 minutes.
When done, let the mandel bread fully cool on a cooling rack. When cooled, use a knife to cut the loaves into ½-inch pieces.
