2 ¼ c.  unbleached flour 
      1/3 c.  cocoa powder 
      2 tsp.  baking powder 
  ½ tsp. salt 
      1 c.  granulated sugar 
      6 T.  unsalted butter, room temperature 
      3 large  eggs 
      1 ½ tsp.  vanilla extract 
      8 oz. (1  1/3 c. ) semisweet chocolate chips 
    ½  c. white baking chips  | 
    Mix flour,  cocoa, baking powder and salt.  In  separate bowl, using electric mixer, beat sugar and butter to blend.  Beat in eggs 1 at a time, then vanilla.  Beat in flour mixture.  Stir in semisweet and white chips.  Drop dough by heaping tablespoons onto  non-stick baking sheet (or Silpat) in two 10” to 11” long strips, spaced 3 inches  apart.  Using metal spatula or wet  fingertips, shape strips into 11” x 2 ½” logs.   Refrigerate 30 min. 
      Preheat  oven to 350 degrees.  Bake logs until  tops are cracked and dry and tester inserted into center comes out clean, about  25 min.  Cool 10 min. 
      Reduce  oven temperature to 300 degrees.  Lift  logs onto work surface.  Using serrated  knife, gently cut warm logs crosswise into 3/4“   thick slices.  Arrange slices, cut  side down, on baking sheet.  Bake until  just dry to touch, about 8 min.  Turn  biscotti over, bake until top is dry to touch, about 8 min.  Cool on sheets.    |