Mix instant coffee powder in water and keep it aside.
Add butter and sugar in a bowl and mix well.
Add the coffee mixture to it and mix.
Next add the flour, corn flour, and the cocoa powder.
Combine everything well and form a dough. Keep it in the fridge for 30 minutes.
After refrigeration, make equal sized cookie balls and shape into an oval shape.
Place the cookie balls on your baking tray and make a gentle cut in the middle using the back of a butter knife to make it look like a coffee bean
Bake at 180C for only 8-10 min.
Let the cookies rest on the baking tray for 10 minutes after baking