To make the filling, in a small bowl, mix both sugars, cinnamon, and salt, stir until well combined.
On a lightly floured surface roll dough into a 14 by 19-inch rectangle.
Spread softened butter evenly over surface of dough, leaving ½ inch on either end bare. Cover butter with cinnamon mixture, spreading to make an even layer. Gently press the surface with your hands to press sugar into dough.
Starting along one long edge, roll dough into a 19-inch log, squeezing log gently to help adhere layers. Trim ½ inch of dough from both ends of the log to make an 18-inch roll.
Using a sharp knife, cut the log into 12- 1 ½ inch pieces. For equal sizing use a tape measure, cut log in half, forming 2 9-inch logs. Next, cut both 9-inch logs in half, making 4- 4 ½ inch logs. Then, cut each quarter into 3 pieces, making 12- 1 ½ inch rolls.
Lightly grease a 9x13 baking dish with cooking spray. Place 12 rolls in dish, evenly spacing them out. Cover with plastic wrap and rise for 1 hour.
30 minutes before baking, preheat oven to 350 degrees.
When ready to bake, pour ¾ cup of cream over rolls, and in any spaces where rolls are not touching. Bake for 30 minutes, until a deep golden brown.