Rich Piedmontese hazelnut cake made with IGP hazelnuts is intensely nutty and moist. This beloved mediterranean dessert is a family tradition from Italy's northwest.
Preheat oven to 350°F (175°C) and line a 9-inch round cake pan with parchment, buttering the sides for easy removal.
Pulse hazelnuts in a food processor until finely ground, being careful not to over-process into a paste.
In a large bowl, beat the softened butter and sugar until pale and fluffy, then add the eggs one at a time, mixing thoroughly after each addition.
Fold in the ground hazelnuts, flour, baking powder, salt, and vanilla extract. Mix just until the batter is evenly combined—do not overmix.
Pour batter into the prepared pan, smoothing the top. Bake for 30–35 minutes, checking doneness at 30 minutes with a toothpick (it should come out with a few moist crumbs, not wet).
Remove cake from oven and cool in the pan for 10 minutes. Invert onto a wire rack to cool completely before dusting with powdered sugar and serving.