Preheat the oven to 180°C bake and line two baking trays with baking paper.
In a large bowl, combine the flour, baking soda, cocoa powder, salt and chocolate chips.
In a separate bowl, beat the softened butter, brown sugar and white sugar until light and fluffy.
Add the eggs one at a time, beating well after each addition. Mix through the vanilla essence.
Add the dry ingredients to the butter mixture and mix until just combined and a soft biscuit dough forms.
Scoop tablespoon-sized portions of dough and roll into balls. Arrange them on the prepared trays, leaving enough room between each biscuit for spreading.
Gently flatten each ball with a fork, then sprinkle the crushed candy cane over the tops.
Bake for approximately 12 minutes, or until the edges are set but the centres still look slightly soft.
Leave the biscuits on the baking trays for a few minutes to firm up before transferring them to a wire rack to cool completely.