Whisk room temperature butter and sugar until light and fluffy. Now add vanilla essence and coffee water to it and mix it well.

Add all-purpose flour, cocoa powder and corn flour to the mixture and mix everything well to make a dough. Make a smooth dough out of it and cover and chill it in the refrigerator for 30 to 40 minutes.

Divide the dough into 24 equal portions. Now shape each portion into an oval shape and with the help of a butter knife or back of the spoon make a mark in the middle of the oval to make it look like a coffee bean. Prepare all the cookies in the same manner. Put all the cookies on a greased baking tray and bake it in a preheated oven at 170 degree for 15 to 20 minutes. Let the cookies cool down completely at room temperature before use.