Optional: remove skins from the chickpeas for a smoother batter
Line a freezeable dish with greaseproof paper and set aside
Place all of the ingredients (except chocolate) into a blender and blitz until smooth
Spoon the batter into a bowl and fold in the chocolate chips
Move the contents of the bowl into the lined dish and freeze for ~1 hour (until mostly set)
If it freezes too much, slightly defrost before cutting into 8 equal portions with a sharp knife
Melt the chocolate in the microwave (using 30-second bursts and mixing intermittently)
Drizzle the chocolate over the top of the squares
Enjoy!