On a lightly floured surface, gather the dough together and divide it in half. Roll out one half of the dough into a long rectangle about ¼-inch thick. Cut the dough lengthwise into 5⁄8-inch strips, then cut the strips into 4- or 5-inch lengths. Trim off any shaggy edges. Brush the strips with 1 ½ teaspoons of the milk and sprinkle on 1 ounce of the Parmesan cheese. Use a spatula to transfer the strips to one of the prepared baking sheets, arranging them about ½-inch apart. Bake until the cheese is golden brown, 17 to 19 minutes.