There are few things better than a heart full of Nutella! Nonna Gilda’s hazelnut shortbread cookies are an easy way to show someone you love them. They’re also fun to make and decorate with grandchildren.
In a food processor, process the hazelnuts until fine, about 2 minutes. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, combine the butter, sugar, and vanilla. Beat on medium-high speed until fluffy, about 5 minutes. Turn the speed to low and beat in the hazelnuts.
One at a time, add the egg yolks, mixing on low speed, until