In a small mixing bowl, combine the softened butter, brown sugar, cinnamon, flour and salt together with a spatula to form a paste. If the butter is too hard, microwave only 10 seconds (no longer) and mix the ingredients until you have a smooth spreadable paste for the filling of the star.
6 (85g) Tbsp unsalted butter, 1/2 (120g) cup brown sugar, 1 1/2 Tbsp ground cinnamon, 2 Tbsp all-purpose flour, 1/8 tsp fine sea salt
Preheat your oven to 350°F (175°C) and line a cookie baking sheet with parchment. Lightly flour the parchment for later.
A key to working with this dough is to make sure you flour your clean work surface WELL. If you don't flour your surface and rolling pin and the top and bottom of the dough when rolling it out, it is likely to stick and you'll have a hard time shaping your star.
Transfer the dough to the floured work surface, and flour the top of the dough and the rolling pin, Divide the dough into 3 equals sections (you can weigh it if you'd like or you can eyeball this).
Starting with your first dough ball, roll it out to slightly larger than a dinner plate (about a 10 inch circle). If you need, grab a dinner plate and measure to make sure that your dough has been rolled out to the right size. Make sure you keep lightly flouring your dough to avoid sticking. Fold the dough in half and then quarters, and transfer tot he parchment lined baking sheet. Unfold the dough to form the circle on the tray.
Grab the cinnamon sugar paste you prepared earlier, and spread half of the cinnamon sugar paste on the top of the first circle of dough leaving a 1/2 inch border. For easy spreading, I dropped spoonful's of the paste all over the circle and spread it that way.
Roll out the second dough ball the same way (don't forget the flour), to about ten inches or the size of your plate you're using as a guide. Transfer the second circle to the top of the first dough circle spread with cinnamon sugar paste. Spread the remaining cinnamon sugar paste on top of the second circle of dough, leaving a 1/2 inch border.
Repeat the same step with the third dough ball, rolling it out to the same 10 inch circle and transfer the dough to cover the top of the second layer sealing in the cinnamon sugar layer. Using your plate, turn it upside down on your dough and use it as a guide to cut a clean circle using a sharp knife or a pizza cutter.
Now the fun part, cutting and twisting the star! Place a small star cookie cutter in the center of the circle, or use a small cup or measuring cup (bout 2 inches wide) to make sure you don't cut too far and keep the center intact.
Using your pizza wheel or a sharp knife, make 4 evenly spaced cuts from the edge of the dough to the center mark, dividing the dough in quarters but leaving the center intact. Cut each of those quarters in half, to create 8 equal wedges. Cut each of those wedges again, stopping at the center mark, to form 16 total strands radiating from the center.
You should now have 16 evenly sized strips attached to the center circle. perfect for twisting to form your star.
To twist the star points, take two neighboring strands and twist them away from each other- one to the left and one to the right- making 2 full twists. Pinch the ends together and tuck them under to form one star point. Repeat this step with the remaining strands until you've formed eight points to your star. Don't worry about perfection, the star will puff in the oven and create a beautiful design no matter what!
Beat 1 egg with 1 Tablespoon of water, and using a pastry brush or a paper towel folded to make a brush apply the egg wash lightly all over the star for a golden finish.
1 egg, 1 Tablespoon water
Transfer the baking sheet with the shaped star to the preheated oven, and bake on the center rack for 30 minutes or until the star is golden brown and the center feels firm to touch. Internal temperature should read between 190-195 F in the center of the star.
Allow to cool while you prepare the icing.