Once the dough has risen, turn it out onto a lightly floured surface and use a rolling pin to roll it into a 12x18 inch rectangle, about 1/4 an inch thick, making sure the dough is even in thickness throughout.
Spread the softened butter on top using a butter knife or the back of a spoon. Mix the brown sugar, cinnamon, and nutmeg, in a small bowl and sprinkle evenly on the dough. Sprinkle the cinnamon-sugar mixture on top of the butter, making sure it goes all the way to the edges of the dough.
Roll the dough into a log lengthwise, pinching its edges to seal. Use a very sharp knife to cut the roll into 12 pieces (about 1 1/2 inches). Unflavored dental floss is another great option to cut the cinnamon rolls neatly.
Grease a 9x13-inch baking dish with nonstick spray and pour the prepared pecan caramel sauce into the bottom of the pan, spreading it evenly to the corners. Place the rolls on top then cover with plastic wrap or a towel and let rise for another 30 minutes to one hour or place overnight in the fridge to bake in the morning. Rising overnight is ideal, if possible. If you do this, allow the rolls to sit at room temperature for 45 minutes to finish rising before baking.
Position the oven rack to the middle position and preheat the oven to 350°F.
Bake the sticky buns for 24-28 minutes, or until the edges are golden brown and the middle buns reach an internal temp of 175°F. Allow them to cool slightly then invert them onto a cooling rack or serving platter so the sticky pecan topping covers the top of the buns.