Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
In a large bowl, cream together the sugar and butter until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla extract.
Gradually blend in the dry ingredients until just combined. Fold in the toasted hazelnuts and chocolate chips.
Divide the dough in half. On the prepared baking sheet, shape each half into a log about 12 inches long and 2 inches wide. Space them apart as they will spread.
Bake for 25-30 minutes, or until the logs are light golden brown.
Remove from the oven, and set aside to cool for 10 minutes. Reduce the oven temperature to 325°F (160°C).
Transfer the logs to a cutting board and slice diagonally into 1/2 inch thick slices using a serrated knife.
Place the slices cut side down on the baking sheet and bake for an additional 10-15 minutes, turning once, until they are crisp and golden.
Transfer to a wire rack to cool completely before serving.