Beat butter and sugar at medium-high
speed until light and creamy, about 2 minutes. Add eggs, and beat until smooth, about 3 minutes. Beat in vanilla. Combine flour, baking powder,
cinnamon, salt, and zest. Add to butter mixture; beat on medium speed until combined, about 1 minute. Refrigerate for at least
30 minutes.
Form dough into 3/4-inch balls, and roll in ground hazelnuts. Place balls on ungreased baking sheet
1 inch apart. Bake until cookies begin to set, about 8 minutes. Remove from oven. Working quickly, make
a slight indentation in each cookie with your thumb. Return to oven, and bake |