Preheat oven to 190 degrees celsius (fan-forced). Line 2 baking trays with baking paper and set aside.
Place the dates into the Thermomix bowl and chop for 5 seconds on Speed 8. Scrape down the sides of the bowl and repeat for a further 5 seconds.
Add the butter, brown sugar and golden syrup into the Thermomix bowl and heat for 5 minutes, 90 gredrees, Reverse, Speed 3.
Add the flour, baking powder, ginger, cinnamon and nutmeg to the bowl and mix for 10 seconds on Speed 4. Scrape down the sides of the bowl and mix for a further 5 seconds.
Take teaspoons of the mixture and place onto the prepared baking trays, allowing room for spreading. Press down a little with a fork or back of the spoon.
Bake for 12-15 minutes or until golden. Cool on the tray slightly before moving them to a wire rack to cool completely.
Melt the chocolate and drizzle over the top of the cookies once cooled. Leave to set. Store in an airtight container.