Preheat your oven to 350°F (180°C). Grease a 9-inch (22 cm) cake pan and line the bottom with parchment paper.
In a large bowl, whisk together the flour, baking powder, salt, cocoa powder, and ground hazelnuts.
In another bowl, whisk the eggs with the sugar until light and fluffy. Add the melted butter and milk.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Do not overmix.
Pour the batter into the prepared cake pan and bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is baking, prepare the chocolate ganache: heat the heavy cream in a saucepan until just simmering. Pour over the finely chopped dark chocolate. Let it sit for a minute, then stir until smooth and glossy.
Let the ganache cool slightly, then whisk in the powdered sugar.
Once the cake has cooled completely, slice it in half horizontally. Spread the bottom layer with chocolate ganache, then top with the other layer.
Frost the top and sides of the cake with the remaining chocolate ganache, smoothing it evenly.
Sprinkle with toasted hazelnuts. Refrigerate for at least 1 hour to allow the ganache to set.
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