Chocolate? Yum... Hazelnuts? Yum... Put 'em together and these cookies are outstanding. So much fun for Brendan to help with too. He loved rolling the balls in hazelnuts and his tiny little thumbs made the best little thumbprints. I omitted the espresso since I wanted Brendan to be able to have one without bouncing off the walls. And I reinforced the thumbprints with a measuring spoon after removing them from the oven so they would hold a little more filling. This recipe? Definitely a keeper!