
Pre-heat oven to 350F/180C. Grease and flour or spray or line with parchment paper an 7 inch / 18 cm round cake pan or springform pan.
In a medium bowl whisk the flour, baking powder and salt.
In a blender or food processor add the chopped nuts and half the sugar, blend until finely chopped.
In a mixing bowl or stand mixer beat the remaining sugar and the softened butter until creamy, approximately 2-3 minutes, then add the vanilla and the egg and yolk one at a time, add the dry ingredients and beat for 4-5 minutes to combine, add the nuts and combine.
Transfer the batter to the prepared cake pan and bake 30-40 minutes, until done. Check with a toothpick for doneness, if the toothpick is dry or with a few crumbs attached it's done. Let cool 15-20 minutes in the pan then move to a wire rack to cool completely, dust with powdered sugar before serving. Enjoy!