Preheat oven to 325°.
Combine first 7 ingredients in a bowl. Stir well; set aside. Combine eggs, egg white, vanilla, orange rind, and orange juice in a large bowl, and stir with a whisk. Add flour mixture, and stir until well-blended.
Turn dough out onto a baking sheet coated with cooking spray. Shape dough into two 13-inch-long rolls; flatten to 1-inch thickness. Bake at 325° for 25 minutes or until firm to the touch. Remove rolls from baking sheet; let cool 10 minutes on a wire rack.
Reduce oven temperature to 275°.
Cut each roll diagonally into 18 (1/2-inch) slices. Place slices, cut sides down, on baking sheet. Bake at 275° for 40 minutes (cookies will be slightly soft in center but will harden as they cool). Remove from baking sheet; let cool completely on wire rack.