Hazel nut cake recipe

Hazelnut Cake:

• 1 3/4 cups all-purpose flour

• 1/2 cup hazelnut flour sifted

• 2 1/4 tsp baking powder

• 3/4 tsp salt

• 3/4 cup unsalted butter room temperature

• 1 1/2 cup granulated sugar

• 3 large eggs room temperature

• 1 1/2 tsp vanilla

• 1 cup milk room temperature

Hazelnut German Buttercream:

• 2 cups milk divided

• 1 tsp vanilla

• 1/4 cup cornstarch

• 2/3 cup granulated sugar

• 2 large egg yolks

• 2 cups unsalted butter room temperature

• 3/4 cup hazelnut flour sifted

• powdered sugar sifted, to taste