01 - Whisk together all-purpose flour, baking powder, and salt in a medium bowl; set aside.
02 - Beat softened butter and granulated sugar with an electric mixer until light and fluffy, approximately 2 to 3 minutes.
03 - Add egg, vanilla extract, and peppermint extract to the creamed mixture and blend until fully combined.
04 - Gradually add the dry ingredient mixture to the wet ingredients, mixing just until dough forms.
05 - Separate dough into two equal portions; incorporate red gel food coloring evenly into one portion.
06 - Wrap both dough portions tightly in plastic wrap and refrigerate for 30 minutes.
07 - Preheat oven to 350°F and line two baking sheets with parchment paper.
08 - Roll tablespoon-sized pieces of each colored dough into 6-inch ropes; twist ropes together and coil spirally or shape as desired.
09 - Place shaped cookies 2 inches apart on prepared baking sheets.
10 - Sprinkle crushed peppermint candies evenly over each cookie.
11 - Bake for 9 to 11 minutes until edges are set but not browned.
12 - Allow cookies to cool on baking sheets for 5 minutes before transferring to wire racks to cool completely.