Preheat the oven to 350 degrees F (180 degrees C) and line two baking sheets with parchment paper.
In a medium heat-proof bowl, add the chocolate and butter. Microwave in 20 second increments until fully melted.
In a small bowl, stir together the cocoa powder, espresso powder, and hot water. Set aside.
In a large bowl, add the brown sugar, granulated sugar, eggs, and peppermint extract. Use an electric hand mixer to beat on medium-high speed for 2-3 minutes until doubled in size and pale in color.
Mix in the chocolate, butter mixture and bloomed cocoa powder mixture until fully combined.
Add in the flour, baking powder, and salt, and mix on low speed until just combined.
Allow the cookie dough to rest at room temperature for about 10 minutes to thicken up.
Using a 3 tablespoon cookie scoop, scoop the batter onto the prepared baking sheets about two inches apart.
Bake the cookies for about 10 minutes until they are crackly, shiny, and appear set.
Allow the cookies to cool completely on baking sheet before decorating.
Drizzle melted chocolate on each cookie and top with crushed candy canes, and enjoy!