Mix in dry ingredients alternately with milk, beginning and ending with dry ingredients. Divide dough in half. Flatten each half into disk. Wrap in plastic and refrigerate until firm, about 1 hour. Preheat oven to 375 degrees F. Spray 2 large baking sheets with nonstick spray.
Transfer cookies to prepared baking sheets.
Gather and reroll scraps. Cut additional cookies. Sprinkle cookies with sugar crystals. Bake until cookie edges are golden brown, about 8 minutes. Transfer to rack and cool completely.