Place the cake mix, flour, and salt in the bowl of a stand mixer with the dough hook attachment and turn on for 10-15 seconds. Pour in the yeast mixture and mix.
Spray a square of plastic wrap, large enough to cover the bowl, and place it over the bowl to cover the dough.Place the bowl in a dry, warm place and let the dough rise until double in size.
Spread softened butter over the rectangle and cover the top of the dough evenly with the brown sugar. Then sprinkle the cinnamon evenly over the brown sugar.
Gently slide a piece of dental floss under the roll. Find the place to cut and pull the two ends of the floss up over the roll and cross them. Pull them tight around the roll and the floss will cut through.
Place the softened butter in the bowl of a stand mixer and beat for 1 minute. Add the softened cream cheese and beat with the butter for another 2 minutes.
Spread the frosting on the cinnamon rolls or pipe onto them with a large star tip. These cinnamon rolls can be made ahead of time. Check the link below for freezing instructions.