Preheat the oven to 350F/160C and line 2 baking trays with baking paper.
Place all the dry ingredients in a bowl and stir to combine.
Melt the butter and vanilla together in a medium saucepan.
Stir the baking soda and boiling water together in a small bowl, and then add to the butter. Be careful, because it will foam up.
Quickly add the butter to the dry ingredients and stir together with a wooden spoon.
Take tablespoons of the mixture and roll them into walnut sized balls. Place them on the baking trays, leaving plenty of room between them as they spread to double their size.
Bake for 10-12 minutes or until golden brown and spread. They will be very soft, so leave them to cool on the tray for five minutes before transferring to a wire rack.
Once cooled, these are just the right combo of crispy and chewy and they make awesome ice cream sandwiches.
Recipe by The Sugar Hit at http://www.thesugarhit.com/2016/04/21st-century-anzac-biscuits.html