01 -
In a medium bowl, sift together the flour, baking powder, and salt.
02 -
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter until smooth, about 2 minutes. Add the sugar and continue beating until light and fluffy, about 3 minutes.
03 -
Add the eggs one at a time, beating between each addition, then add the vanilla.
04 -
Turn off the mixer. Add the flour mixture and beat just until combined.
05 -
Separate the dough into three equal pieces. Shape each piece into a 4x4-inch square, wrap in plastic wrap, and chill in the fridge.
06 -
Return one piece of dough to the stand mixer, add red food coloring, and mix on low until desired color is reached. Repeat for the second and third pieces using blue food coloring for one. Wrap each colored dough in plastic and refrigerate.
07 -
Remove dough pieces from the fridge and cut each square in half. Roll one half of each color to 1/8-inch thickness between waxed paper.
08 -
Layer the rolled red dough, white dough, and blue dough by peeling back wax paper and stacking. Lightly roll the layers together to adhere.
09 -
Roll the layered dough tightly starting from the short side. Repeat for remaining dough. Wrap logs in wax paper and plastic wrap, then refrigerate for 1 hour.
10 -
Roll the chilled dough logs occasionally or stand them upright in glasses in the fridge. Refrigerate for 4 additional hours.
11 -
Preheat oven to 350°F. Line two baking sheets with parchment paper. Slice each log into 1/4-inch rounds and place them 2 inches apart on the baking sheets.
12 -
Bake the cookies for 9 to 11 minutes until pale golden. Transfer them to a rack to cool completely.