Combine flour and cocoa powder in a large mixing bowl.

Cut in butter with fork or pastry blender until mixture resembles fine crumbles.

Form into a ball and knead until smooth.

Press dough into a 6x8 inch rectangle (1/2 inch thick) on lightly floured surface.

Cut into strips (2 inch x 1 inch) and place on baking sheet lined with parchment paper.

Bake at 325 degrees for 20-25 minutes.

Cool.

Dip cooled cookies in melted white chocolate and drizzle with melted milk or semisweet chocolate.