Crackly Cinnamon Sugar Cookies
Preheat oven to 350°F with racks in upper and lower thirds. In a medium bowl, whisk together flour, baking soda, cinnamon, and salt. In a stand mixer fitted with paddle attachment, beat butter with both sugars on medium speed until light and fluffy, 2 minutes. Beat in egg and vanilla. Reduce speed to low; gradually add flour mixture. Beat until combined.Advertisement
Scoop dough using a 1 1/2-inch scoop (about 1 1/2-tablespoons); transfer to parchment-lined baking sheets, 2 inches apart. Flatten cookies slightly with a spatula. Sprinkle tops with sanding sugar, then lightly brush with a wet pastry brush and sprinkle with more sanding sugar.
Bake, rotating sheets halfway through, until cookies are just beginning to brown at edges, 12 to 14 minutes. Let cool 5 minutes on sheets, then transfer to a wire rack and let cool completely. Cookies can be stored in an airtight container at room temperature up to 3 days.