Combine the liqueur, corn syrup and coffee granules in a small bowl. Stir together until the coffee granules dissolve. Combine the cookie crumbs, 3/4 cup powdered sugar and hazelnuts; stir. Pour the liqueur mixture into the crumb mixture and stir until all the crumbs are moistened. Shape into 1” balls; roll in powdered sugar and let stand for 10 minutes. Roll a second time in powdered sugar.