Preparation Steps

• Preheat oven to 350°F (175°C).
• In a medium bowl, whisk together flour, cocoa powder, baking soda, and salt.
• In a large bowl, cream together butter and sugar until light and fluffy. Beat in the egg and vanilla extract.
• Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in chopped hazelnuts.
• Roll dough into 1-inch balls and place on ungreased baking sheets. Make a small indentation in the center of each cookie.
• Bake for 10-12 minutes, or until edges are set. Let cool on baking sheets for a few minutes before transferring to a wire rack to cool completely.