Shape. Lightly punch the dough down, and remove it from the bowl. Place the bowl on a kitchen scale, zero it out, and place the dough back in the bowl to weigh it. Now divide it in half. Cover ½ of the dough with the plastic wrap, and manually stretch out the other half using your fingers. Cover it with plastic, and repeat with the half dough in the bowl. Cover it with plastic.
Roll. Remove the plastic from the first dough rectangle, and using a rolling pin, roll the dough out to roughly 8" X 18". Try to square off the corners as best you can, using the rolling pin. Cover it in plastic, and repeat with the other rectangle. Cover with plastic.
Pro-Tip: It's important to keep the dough covered when not being worked on. Otherwise the flour in the dough creates a dry crust on the dough.
Fill, roll up, and cut. Combine the brown sugar and cinnamon in a small bowl to make the filling. Butter a 9" X 13" baking dish. Remove the plastic from one dough rectangle, and spread ½ of the filling over the dough. Starting with the long edge, gently tuck the edge in and roll up the dough to form one long roll, 18" long. Slice the roll into 12 pieces, each 1 ½" wide. Arrange them in the baking dish. Cover with plastic, and repeat with the other dough rectangle.
Second rise. Cover and rest for 45 - 60 minutes, or until the dough rises and is puffy. The rolls should take up all the space in the baking dish.
Bake. While the rolls are doing their second rise, move a rack to the lower ⅓ of the oven, and preheat the oven to 350˚F. Bake the rolls for 22-25 minutes, or until the internal temperature reaches close to 190˚F. I use an instant thermometer to test this.
Ice. Whisk together all of the ingredients for the icing, being sure to sift the confectioners' sugar. All lumps must be removed to get a smooth icing. When the rolls are done, run a sharp knife around the edges, and slight lift from the baking dish. Flip out onto a cooling tray, and turn over. Lightly ice each roll using a small rubber spatula. After 10 minutes of cooling, lightly ice each roll again.
Serve. To serve, use a sharp knife to separate each individual roll. You may need to slice through the dough. Serve warm.