Working with one piece of dough at a time, roll it out to a rectangle, about 12 inches by 18 inches.
Spread half of the melted butter over the dough, leaving an inch border on the top long edge of the rectangle. Sprinkle half the brown sugar mixture on top of the melted butter, continuing to leave the inch border at the top edge. Leaving this border will help in sealing the dough shut when rolled up.
Start with the long side closest to you, and working from left to right, roll up the dough into a log. Try to tighten and pull the dough as you go - it will create more cinnamon swirls in your rolls. When you get to the end, pull the dough up and over the roll. Pinch the seam shut.
Using a piece of dental floss or baker’s twine, make a light indentation where your cuts will be. One rollout will give you 9 large cinnamon rolls. This will be your guide to know where to cut and to help make them all the same size.
When ready to make your cuts, slide the floss under one end of the dough, bring the ends of the floss up, cross them over and tug to cut through the dough, making a 2-inch-wide roll. Continue to cut to get 9 equal sized cinnamon rolls. Roll out, fill, and divide the second piece of dough.