Heat oven to 350°F. Line cookie sheet with waxed paper. In large bowl, break up cookie dough. Stir or knead in flour until well blended. Reshape dough into 7-inch roll; press sides of roll to form a triangle-shaped roll. Cut 15 (1/4-inch) triangle-shaped slices from roll of cookie dough (for witch hats), reserving remaining dough for witch faces. (If dough is too soft to cut into slices, refrigerate up to 30 minutes.) Place slices on cookie sheet; place in refrigerator.