Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, cocoa powder, instant coffee, baking soda, and salt. Set aside.
In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add the egg, vanilla extract, and peppermint extract to the butter-sugar mixture. Mix well to combine.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Fold in the chocolate chips until evenly distributed throughout the dough.
Using a cookie scoop or tablespoon, drop rounded portions of dough onto the prepared baking sheet, spacing them about 2 inches apart.
If desired, gently press down on each cookie with the back of a spoon to slightly flatten.
Bake in the preheated oven for 10-12 minutes, or until the edges are set but the centers are still slightly soft.
Remove from the oven and allow the cookies to cool on the baking sheet for 5 minutes, then transfer them to a wire rack to cool completely.
In a microwave-safe bowl, melt the 1/4 cup of semisweet chocolate chips in the microwave in 30-second intervals, stirring in between, until smooth and melted.
Drizzle the melted chocolate over the cooled cookies using a spoon or piping bag.
Sprinkle crushed candy canes or peppermint candies on top of the chocolate drizzle for added peppermint flavor and decoration.
Allow the chocolate drizzle to set before serving or storing the cookies.