In a food processor blend the biscuits with the coconut sugar and butter until combined and crumbled. Transfer to a tart pan and spread over the bottom and up the sides, firmly pressing down. Place the pan in the fridge to harden while you make the filling.
Melt the vegan butter in a small pan over medium heat. Once melted, whisk in the flour for around 2 minutes to form a paste.
Add in the milk and whisk. Add in the condensed milk and the vanilla essence. Mix well. Sieve in the maizena while continually stirring. Cook this for around 15 minutes until it starts to thicken.
Once thick and creamy, add this on top of the tart base. Sprinkle some cinnamon on top. Refrigerate for a few hours for the tart to set.