01 - Set the oven to 350°F and line two baking sheets with parchment paper.
02 - In a large bowl, beat the butter and sugar together with an electric mixer until light and fluffy.
03 - Incorporate the egg and peppermint extract, mixing until fully combined.
04 - Whisk together the flour, baking powder, and salt in a separate bowl; gradually add this to the wet mixture, mixing just until incorporated.
05 - Scoop rounded teaspoons of dough and roll into balls; place them 2 inches apart on prepared baking sheets.
06 - Bake for 9 to 11 minutes until edges are set but centers remain soft; avoid overbaking.
07 - Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.
08 - In a microwave-safe bowl, melt the chopped chocolate with coconut oil or butter, stirring every 20 seconds until smooth.
09 - Using a spoon or piping bag, drizzle the melted chocolate over the cooled cookies.
10 - Sprinkle crushed peppermint candies immediately over the chocolate before it sets; allow to firm before serving.