Place the silicone mould in the fridge for 10 minutes for the chocolate to set.
Meanwhile, prepare the cookie dough. Place the chickpeas, oats, brown sugar, salt, peanut butter and vanilla extract into the bowl of a food processor and process for 1 minute until the chickpeas are totally broken down and everything is combined. You might have to scrape down the insides of the food processor a few times to make sure everything gets properly mixed up.
Stir in the chocolate chips or chopped up dark chocolate with a spoon.
When the chocolate has set, press 1 tablespoon of the cookie dough into each mould and flatten with the back of a spoon.
Use the remaining melted chocolate to spread on top of the cookie dough, sealing it into the cup.
Return the silicone mould to the fridge and leave to set for at least another 10 minutes.