01 -
In a large mixing bowl, beat softened butter and granulated sugar together using a hand mixer or stand mixer until the mixture is light and fluffy.
02 -
Add eggs one at a time, mixing well after each addition. Stir in vanilla extract until fully integrated.
03 -
In a separate bowl, whisk together the all-purpose flour, salt, and baking powder. Gradually add the dry ingredients to the wet mixture, mixing just until a cohesive dough forms.
04 -
Split the dough evenly into two portions. Reserve one half as the vanilla base.
05 -
Blend the unsweetened cocoa powder thoroughly into the second dough portion to create the chocolate layer.
06 -
Alternate spoonfuls of vanilla and chocolate dough onto a lined baking sheet. Swirl the dough lightly with a toothpick or skewer to achieve a marbled zebra effect.
07 -
Preheat oven to 175°C. Bake for 10–12 minutes or until edges are set. Allow to cool on the baking sheet for several minutes before transferring to a wire rack.