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["Place the softened butter and granulated sugar into a large bowl. Using a mixer fitted with a whisk attachment, cream together the butter and sugar on medium speed for 1 minute, or until combined.", "Add the egg and vanilla extract and continue to beat for 30 seconds to one minute, until light and fluffy.", "Turn the mixer to low, and add the flour, baking soda, and salt to the bowl. Beat the mixture for about 1 minute, until all ingredients are combined.", "Lay a sheet of plastic wrap on the counter, and turn the cookie dough onto it. Flatten into a round disc, and cover with plastic wrap. Refrigerate the cookie dough for 30 minutes.", "While the cookie dough chills, prepare the cinnamon sugar filling. In a medium bowl, whisk together the brown sugar, cinnamon, salt, and melted butter until thoroughly combined. Set aside.", "Remove the chilled cookie dough from the refrigerator. Generously dust a clean work surface with flour.", "Unwrap the cookie dough and place on the work surface. Using a rolling pin, roll the dough into a rectangle approximately 14"" x 9"
