2 and 1/2 cups all-purpose flour , spooned and leveled 2 teaspoons cornstarch 1/2 teaspoon cream of tartar 3/4 teaspoons baking soda 1/4 teaspoon salt 2 teaspoons cinnamon 1/2 teaspoon nutmeg 3/4 cup salted butter , softened to room temperature 3/4 cup packed brown sugar 1/2 cup granulated sugar 1 large egg 2 teaspoons vanilla 1/2 cup canned pumpkin (not pumpkin pie filling) For the Cinnamon Sugar Coating 1/4 cup granulated sugar 1 and 1/2 teaspoons cinnamon …