In a large bowl, beat the butter and sugar until smooth and fluffy.

Add the flax egg and mix until well combined.

Add the vanilla extract

Add the flour, cocoa powder, baking soda, baking powder, and red gel food color and mix until the dough consistency is achieved.

Chill the dough in the refrigerator for 1 hour.

Preheat the oven at 180C and line a baking tray with a silicone mat or parchment paper.

Scoop out equal balls of the cookie dough and coat them in castor sugar followed by icing sugar and place them on the prepared tray.

Bake for 15-18 minutes until it cracks on top and the edges are well baked