3/4 cup butter (softened)
3/4 cup powdered sugar
1/2 teaspoon vanilla extract
1 egg yolk
1 1/4 cups all-purpose flour
1/2 cup toasted and ground hazelnuts
1 egg (beaten)
1/4 cup hazelnuts (chopped)
1/4 cup white coarse sugar crystals (for decorating)
Beat butter and powdered sugar in large bowl with electric mixer on medium speed until light and fluffy, or mix with spoon. Stir in vanilla and egg yolk. Stir in flour and ground hazelnuts until well blended. Cover tightly and refrigerate 1 hour. Heat oven to 350º. Roll one fourth of dough at a time 1/4″ thick on lightly floured surface. Cut into 2 1/2″ rounds. Place about 2″ apart on ungreased cookie sheet. Brush with egg. Sprinkle with chopped hazelnuts and sugar crystals. Bake 8 to 10 minutes or until edges are light brown. Remove from cookie sheet to wire rack.