Bake until firm when gently touched, 10 to 12 minutes. Let cool 3 minutes on the cookie sheet. Use a thin spatula to transfer them to cooling racks to cool completely.
To prepare the sugar coating, place the sugar and cinnamon in a shallow dish. Stir with a fork until completely combined. Roll the cooled cookies in the sugar and serve.
Store in a tightly covered container at room temperature for 3 to 4 days.
