Add crushed shortbread cookies, chopped nuts, cocoa powder, instant coffee crystals (or powder), ground cinnamon, and 1 ¼ cup of sifted powdered sugar to a mixing bowl.
Add brewed espresso to the mixture to moisten it.
Use the mixture to make coffee balls around 1 ¼ inches in diameter.
Once you get the perfect round shape, roll each coffee ball in the rest of the powdered sugar.
Place the coffee balls on waxed paper to dry, which should take about one hour.