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, baking soda, and salt. Set aside.
In a large bowl, beat the softened butter with both sugars until light and fluffy (about 2-3 minutes).
Add the egg, vanilla extract, and instant espresso powder, mixing until well combined.
Gradually add the flour mixture to the butter mixture, mixing just until combined.
Scoop tablespoon-sized amounts of dough and place them on the prepared baking sheet, spacing them about 2 inches apart.
Bake the cookies for 10-12 minutes, or until they are set around the edges. Allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
Once the cookies are completely cooled, scoop a generous amount of coffee or mocha ice cream onto the flat side of one cookie and top it with another cookie, pressing gently to create a sandwich.
Repeat the process until all the cookies and ice cream are used.
If desired, roll the edges of the ice cream sandwiches in dark chocolate shavings for an extra touch of decadence.
Freeze the sandwiches for at least 30 minutes to firm up before serving.
Notes
Serve the sandwiches on a chilled plate and garnish with a sprinkle of cocoa powder or chocolate shavings for an elegant touch. Enjoy this delightful treat on a hot day or as a dessert for special occasions!