01 -
In a stand mixer fitted with the paddle attachment, beat the softened butter and granulated sugar on medium speed until light and creamy, about 3 to 4 minutes.
02 -
Add the egg and vanilla extract to the creamed butter mixture and beat thoroughly, scraping down the sides of the bowl as needed.
03 -
In a separate bowl, whisk together the all-purpose flour, kosher salt, and baking soda until evenly mixed.
04 -
Reduce the mixer speed to low and gradually add the flour mixture to the wet ingredients, mixing until a soft dough forms.
05 -
Divide the dough into three equal portions. Tint one portion with red gel food coloring and another with green gel food coloring. Leave the third portion plain. Shape each into a ball, wrap in plastic, and refrigerate for 1 hour.
06 -
Roll each dough portion between two sheets of parchment paper into a 18 cm square. Chill all squares for 15 minutes.
07 -
Stack the colored and plain dough in the order: red, green, plain. Place a parchment sheet on top and roll the stack into a 30x20 cm rectangle. Remove the top parchment, then starting with a long side, tightly roll into a log. Wrap and freeze for 1 hour.
08 -
Preheat the oven to 175°C (350°F). Line two baking trays with parchment paper.
09 -
Slice the chilled dough log into 8 mm thick rounds. Coat the outer edge of each slice in red sanding sugar. Arrange slices 2.5 cm apart on the prepared trays.
10 -
Bake for 8 to 10 minutes or until cookies are set. Allow to cool for 1 minute on the tray before transferring to a wire rack to cool completely. Once cooled, store in an airtight container.