Add the flour, cocoa powder, coffee granules, baking soda, cornstarch and salt and mix together using a wooden spoon, then prepare 3 large baking trays by lining them with baking parchment or a silicon mat.
Scoop out a heaped tablespoon of the cookie dough, roll into a ball, then squash it flat. Place a Rolo in the middle, then wrap the cookie dough around the Rolo. Roll back into a ball shape and place on the tray.
When you’re ready to bake the cookies, pre-heat the oven to 325F. Divide the cookie dough balls between the three trays so there’s plenty of space between each one. Place in the oven and cook for 7-8 minutes.