01 - In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
02 - In a large bowl, beat the butter and sugar until light and fluffy, approximately 2 minutes.
03 - Add the egg, vanilla extract, and peppermint extract to the creamed mixture and beat until fully combined.
04 - Gradually add the dry ingredients to the wet ingredients, mixing until a soft dough forms.
05 - Divide the dough in half. To one half, add several drops of red gel food coloring and mix until evenly colored.
06 - Roll each half between parchment sheets into rectangles about 1/4 inch thick (approximately 9 by 7 inches).
07 - Carefully place the red dough rectangle atop the plain one and remove the top parchment sheet.
08 - Starting from the long edge, tightly roll the layered dough to form a log using the parchment paper to assist. Wrap and refrigerate for at least 1 hour until firm.
09 - Preheat oven to 350°F. Line baking sheets with parchment paper.
10 - Slice the chilled dough log into 1/4-inch rounds and place on the prepared sheets, spacing cookies about 2 inches apart.
11 - Optionally, sprinkle crushed peppermint candies on each cookie.
12 - Bake for 9 to 11 minutes until just set and not browned. Cool on baking sheets for 5 minutes, then transfer to a wire rack to cool completely.