Preheat your oven to 150℃/300°F (fan forced).
In a mixing bowl, combine the flour, cacao powder, bicarbonate of soda and salt.
In a blender or food processor, mix the vanilla, oil, milk and syrup until well combined. Thermomix 30 sec, speed 4.
Add the wet to the dry ingredients and mix together until dough forms. Thermomix 30 sec, speed 4 or until combined.
Roll into a ball, wrap in cling wrap or baking paper and refrigerate for 30-60 minutes.
Place the dough between two pieces of baking paper and roll to approximately 2-3 millimetres thick. Cut rounds with a cookie cutter, place on a lined or greased baking tray and bake for 10 minutes.
Leave on the tray until completely cooled and add a filling or eat as they are. Either way, they are really good!