01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together gluten-free flour, baking soda, and salt. Set aside.
03 - In a large bowl, beat the softened butter and sugar together until light and fluffy, about 2 minutes.
04 - Add the egg, vanilla extract, and peppermint extract; mix until combined.
05 - Gradually add the dry ingredients to the wet ingredients, mixing just until incorporated.
06 - Fold in the crushed peppermint candies and white chocolate chips.
07 - Scoop rounded tablespoons of dough onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Bake for 10–12 minutes, until the edges are just set and the centers are still soft.
09 - Let cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.
10 - Drizzle cooled cookies with melted white chocolate and sprinkle with extra crushed peppermint candies.