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!
Notes
Store the cake in a cake container or well wrapped. It will keep for up to 3 days at room temperature as long as it isn’t frosted or glazed. If you store it in the fridge, wrap tightly to keep it from drying out. It will keep for up to 5-6 days in the fridge.Be sure to cool the cake completely then wrap it tightly in either plastic wrap or foil, place it in a freeze safe bag. The cake will keep for up to 2 months. When ready to thaw place the wrapped cake in the refrigerator to thaw before serving.