Sift together all-purpose flour, baking soda, and salt in a bowl.

Beat together butter and shortening using an electric mixer in another bowl until combined; add sugar and continue beating until light and fluffy, about 5 minutes. Pour in eggs, one at a time, beating well after each addition. Pour in flour mixture and blend until batter is smooth.

Dust a work surface with flour and roll out cookie dough with a floured rolling pin into a 1/4-inch thick rectangle. Sprinkle cinnamon generously over the dough. Roll up the dough gently into a log starting on one of the long sides. Wrap tightly in plastic wrap and refrigerate for 2 to 3 hours.

Preheat the oven to 350 degrees F (175 degrees C).

Unwrap the dough log and carefully slice into 1/4-inch pieces without smashing down the cookie. Place on an ungreased baking sheet.

Bake in the preheated oven until lightly golden around the edges, about 12 minutes.