Preheat the oven too 300F. No-Stick three cookie sheets (Pam, Butter, no stick trays) Sift the flour and salt into a medium bowl, Beat the butter and sugar in a large bowl with an elextre mixer at high speed until creamy. Mix in the dry ingreients and hazelnuts to form a stiff dough. Form into balls the size of walnuts and place 1 inch apart on the cookie sheets.

Bake one sheet at a time (in all honesty I use the same sheet over and over) for 25 - 30 mins or until lightly browned. Transfer to racks to cool.

Filling : Heat the Nutella in a double boiler over barely simmering water until liquid. Remove from heat and mix in the cream until well blended. Let cool completely.