In a medium bowl, use a hand mixer on medium speed to beat the aquafaba until consistently foamy, 2-3 minutes.
Add the sugar, oil, and vanilla extract to the bowl containing the aquafaba and blend on medium until smooth.
Add the flour, baking powder, cinnamon, cocoa powder, and salt to the bowl and blend until well combined.
Fold in the chocolate chips with a silicone spatula.
Cover the bowl with plastic wrap or place batter in an airtight container and put it in the fridge for at least two hours, or overnight.
Preheat the oven to 350℉. Divide the batter into four flat logs and arrange them on two parchment paper-lined cookie sheets. Bake for about 30 minutes. The logs will still be somewhat soft but the edges should look slightly crisp.
Allow the mandel bread to cool, about 25-30 minutes. Lower the oven temperature to 250℉.
Transfer the cooled logs to a cutting board and use a sharp knife to slice each log into 8-10 pieces. Place the cookies on their side on the same parchment-lined cookie sheets, and bake for about 20 minutes. Turn off the oven and leave the mandel bread in the oven to rest for at least 30 minutes, until crisp.