Heat oven to 325°. Mix flour, cappuccino, baking powder and salt. Beat butter, sugar, eggs and vanilla in large bowl with electric mixer on medium speed until well blended. Gradually beat in flour mixture. Stir in nuts. Divide dough into 2 equal portions; shape into 2 (14 inch) logs on lightly floured surface. Place 2 inches apart on greased and floured cookie sheet.
Bake 25 minutes or until lightly browned. Remove from cookie sheet, cool 5 minutes. Cut logs diagonally into 3/4-inch slices. Place on cookie sheet 1/2-inch apart. Bake 10 minutes or until slightly dry. Makes about 2 dozen.