Cream together 1/2 cup of softened butter with 1/4 cup of granulated sugar and 1/4 cup of tightly packed brown sugar
Add 1 egg and 2 teaspoons of vanilla extract and mix until smooth and creamy
Place a large mesh sifter over the bowl containing your wet ingredients and add 1 1/2 cups of flour, 2 tablespoons of cornstarch, 1 teaspoon of espresso powder, 1/2 teaspoon of baking soda, 1/4 teaspoon of salt and 3 tablespoons of cocoa powder into it
Gently sift the dry ingredients into the wet ingredients and mix to combine
Add 1/2 cup of mini chocolate chips and fold them in until all of the ingredients have been fully incorporated
Transfer the dough out onto a lightly floured work surface
Knead the cookie dough a few times, lightly dusting with flour if sticky, and then tightly wrap the dough in plastic wrap
Chill the wrapped dough in the refrigerator for 60 minutes
Unwrap the chilled dough and place it onto a lightly floured surface
Gently roll out the chilled dough to 1/2-3/4 inch thickness using a floured rolling pin and cut rounds from the rolled out dough using a 1 1/2 or 2 inch round cookie cutter
Use your fingers to gently shape the rounds into tear drops (optional)
Sprinkle additional mini chocolate chips over the top of each cookie
Set the prepared cookies onto a parchment lined baking sheet
Return the cookies to the refrigerator to 20 minutes while your oven is preheating
Preheat the oven to 350 degrees
Bake on a middle rack at 350 degrees for 14 minutes
Transfer the baking sheet onto a cooling rack for 5 minutes before transferring the cookies directly onto it
Serve with milk or coffee