01 -
Combine instant coffee granules with hot water in a small bowl. Allow to cool slightly.
02 -
In a large bowl, beat the unsalted butter and icing sugar together until light and fluffy.
03 -
Add the beaten egg and cooled coffee mixture to the creamed butter. Mix thoroughly until homogenous.
04 -
In a separate bowl, whisk together all-purpose flour, cornstarch, and ground cinnamon.
05 -
Gradually add the dry ingredients to the wet mixture, mixing until a soft dough forms.
06 -
Scoop tablespoon-sized portions of dough and roll into balls. Arrange evenly on a baking sheet lined with parchment paper, leaving space between each.
07 -
Bake in a preheated 350°F (175°C) oven for 20–25 minutes, or until the edges are lightly golden. Cool completely on a wire rack.
08 -
Dip half of each cooled cookie into melted dark chocolate, then sprinkle immediately with chopped pistachios. Set the cookies on parchment paper until the chocolate sets.