In a medium bowl, whisk together the flour, baking soda and salt.: The dry mixture should smell faintly of flour with a subtle saline hint, and you want it to be evenly colored with no lumps. Whisking aerates the components slightly, which aids in consistent rise and prevents pockets of baking soda that could create odd tastes. A common mistake is to skip this step and end up with uneven leavening, which causes some cookies to overexpand while others stay flat. If you notice clumps, press them through a sieve to avoid dense spots.
In a large bowl, use an electric mixer to combine the shortening and sugar until smooth. Mix in the syrup, egg and vanilla. Add the dry ingredients and mix well. Cover and refrigerate for a couple of hours until dough is more firm.: At first you'll hear a soft hum as the shortening and brown sugar cream together, and the mixture will look glossy and slightly pale. Adding the pure maple syrup brings a viscous sheen and an aroma that becomes more pronounced as you mix. The dough will loosen when you add wet ingredients, then firm up once the dry mix is incorporated. Chilling is crucial, it lets the fats solidify so the cookies do not over spread, and it allows flavors to meld. If you skip chilling you'll likely end up with flatter cookies, so resist the urge to bake immediately. Common troubleshooting here is over mixing, which makes the dough tough, so stop as soon as the flour is incorporated.
Preheat oven to 350°F. Line baking sheets with parchment paper or silpat mats.: When the oven comes up to temperature you should feel warmth from the door and notice the steady hum of the thermostat cycling. A well preheated oven ensures predictable spread and color development, leading to those golden edges and set centers. Lining the pans prevents sticking and promotes even browning. A typical error is placing sheets in an oven that is not fully preheated, which can result in underbaked middles or uneven textures. If your oven runs hot, consider an oven thermometer to verify accuracy.
In a small bowl, combine the sugar and cinnamon. Shape the cookie dough into balls about 1-inch in diameter (or larger). Roll in the sugar/cinnamon mixture.: The sugar mixture should smell sweet and warm from the ground cinnamon , and when you roll the chilled dough it should be firm to the touch with a smooth surface. Rolling helps the sugar adhere and creates the crackled visual as the cookie expands. If the dough is too sticky to form smooth balls, chill it longer or lightly flour your hands. A frequent mistake is rolling balls that are inconsistent in size, which leads to uneven baking times; use a cookie scoop for uniformity.
Place the cookie dough balls on the prepared baking sheets about 2 inches apart and bake for 10 to 12 minutes, or until not doughy-looking in the middle.: While baking you will notice the tops matte slightly and then develop tiny fissures as the sugar expands into its crackled pattern; the scent will shift from sweet to toasty. The edges should become faintly golden while centers still look slightly soft, which indicates chewiness once cooled. Avoid overbaking, which dries the cookies and blunts the maple flavor. A common pitfall is crowding the pan, which causes cookies to run together, so leave adequate space and rotate sheets halfway if your oven bakes unevenly.