Dissolve yeast in water, add salt and sugar. Add cake mix slowly and add flour as needed. Knead and let raise. Make out rolls and let raise again. Bake at 350 degrees for 30 minutes. I make 2 batches at a time, and use 3 recipes worth of the filling for this amount of dough.
Filling is made from the sugar, dark brown sugar, cinnamon and melted butter being melted together. Sprinkle dough with additional cinnamon when rolled out (I roll on a large cutting board to 21 inches in length and as wide as I can, rolling 1/2 the dough at a time), then put a line of filling as needed to cover when you roll.
Remove from hot pans to cool, and then make frosting. Blend powdered sugar with stick of butter and add 2-3 healthy dashes of vanilla and enough milk to get the right consistency. Rolls can be frozen and warm well in the microwave.