Step 1

Heat oven to 350ºF.

Step 2

Sift together flour, baking powder and salt; set aside. Beat butter, sugar and lemon zest in separate large bowl with mixer until well blended. Add eggs, 1 at a time, beating well after each. Blend in extract. Gradually beat in flour mixture. Stir in chocolate and nuts.

Step 3

Divide dough in half; shape each half into 12x1-inch log on floured surface. Place on greased baking sheet.

Step 4

Bake 35 min. or until golden brown. Cool on baking sheet 10 min. Transfer to cutting board. Cut each log diagonally into 21 slices, using serrated knife. Return, cut-sides down, to baking sheet. Bake 5 min. or until crisp. Remove to wire racks; cool completely.