CHECKERBOARD SQUARES melted chocolate or chocolate icing and white icing In large bowl of electric mixer, combine cookie mix, egg and vanilla. At low speed, beat until mixture forms a dough. Divide dough in half; remove one half from bowl. To dough in bowl, add cocoa powder; knead to mix well. On work surface, on separate sheets of waxed paper, roll each half of dough to 9x6" rectangle. Using paper to lift dough, invert plain dough onto top of chocolate dough. Remove paper from plain dough. Using long chef's knife, cut doughs lengthwise into 2" wide strips. Stack strips, removing waxed paper and alternating colors. Cut stack lengthwise into three equal strips. Stack strips so colors alternate; gently press stack so dough layers stick together. Wrap stack in plastic wrap; refrigerate 2 hours. Preheat oven to 375F. Lightly grease 2 baking sheets. Remove plastic wrap from dough; cut stack crosswise into 1/4" slices. Place slices checkerboard side down on prepared baking sheets; bake 8 min or until golden. Transfer to wire rack to cool. With pastry bag and writing, decorate cookies with dots of chocolate and icing. Makes 4 dozen cookies.