01 -
Cream together the softened butter and granulated sugar in a mixing bowl until light and fluffy.
02 -
Separate the dough into two equal portions. Leave one plain and mix the unsweetened cocoa powder into the other portion.
03 -
Alternate placing small portions of vanilla and chocolate dough in a baking pan. Use a toothpick or skewer to swirl the layers and create a zebra pattern.
04 -
Refrigerate the dough for at least 30 minutes to prevent spreading during baking.
05 -
Preheat the oven to 350°F (175°C). Bake the cookies for 10-12 minutes. Allow them to cool on the baking sheet for 5 minutes before transferring to a wire rack.