1. Cream the butter with the sugar until light. Add in the egg and mix well. 2. Mix together the flour and cornstarch. Add this to the creamed mixture and blend. Mix in the hazelnut flour thoroughly. 3. Form the dough into a bowl and wrap in plastic. Chill for about 4 hours. 4. Roll out the dough to 1/4 inch thickness. Cut with a mini cookie cutter(mini ones are widely available). Place cookie on a grease baking sheet. 5. Chill the cookies for 10 minutes and preheat oven to 325°F Bake cookies for about 10 minutes or until lightly browned. Cool on a rack. 6. Sprinkle with powdered sugar.
