Start by proofing the yeast by adding warm water and the 2 packets of yeast to a small bowl. The water needs to be at least 95 degrees but no hotter than 110 degrees. It takes about 5 minutes to proof.
While the yeast is proofing Mix together 3 1/2 cups of flour , cake mix, and sugar in a large bowl.
Make a well to pour the liquid in
Once the yeast is completely dissolved give it a little stir and pour into the well of the dry ingredients.
I use a stand up mixer with a dough hook but this can be mixed by hand . Start mixing the water into the dough , once everything is incorporated it will sticky . Add the remaining cup of flour .
Either knead with the mixer and dough hook or knead on a floured surface. You will need to add flour if the dough gets too sticky to knead . If the dough sticks to the sides of the bowl scrap the sides down and add a few Tablespoons of flour around the edges .
After about 5 minutes of kneading the dough should smooth and elastic like
Form the dough into a ball and Place in an oiled bowl
Cover with a towel and place in a warm, non drafty area to allow to rise. The dough should double in size after about an hour
In a small bowl mix the brown sugar , sugar and cinnamon for the filling and set aside
Once the dough has doubled in size punch it down and turn out onto a floured surface.
Cut dough in half , set one half aside and keep one on the floured surface
Roll the dough evenly to rectangle , it should be about 14x10
Spread 4 tablespoons of room temperature butter out on to the dough, leaving about a 1/2 inch all the way around free of butter
Sprinkle half of the cinnamon sugar mixture over the butter
Start rolling the dough up like a jelly roll starting with the long side.
Carefully cut rolls 1/2-3/4 inch wide and place them in an oiled pan. Depending on how you cut them you should get 12 per roll which is perfect for a 9x13 pan. Just make sure you leave enough room for them the rise. (so a total of 24 give or take)
Cover and let rise again , they should double in size . It should take about 30 minutes and preheat oven to 350 degrees
Repeat this process with the other dough or get them ready to parpaking and freezing
Place rolls in a preheated oven and bake for 20-25 minutes, or until slightly golden brown
While rolls are baking mix all the ingredients for frosting
Let the rolls cool for about 10 minutes and spread frosting on top of rolls