Warm milk and 3 tbsp of butter in a microwave safe bowl to 110℉ not hotter or colder. Use a thermometer know the temperature
Now add the yeast. Mix and let is sit for 10 minutes.
In a large mixing bowl, or in a kitchen aid mixer, add the flour, sugar, and salt. Mix well.
Add the milk mixture and egg.
If using a kitchenaid- Mix with the dough hook attachment. Add flour as it is mixing until becomes a smooth dough ball. Not too sticky but still soft.
If mixing by hand, add flour on the counter and knead until soft.
Spray a medium bowl with non-stick spray and add the dough. Cover loosely with a tea towel or plastic wrap. Let it rest for 10 minutes.
While the dough is resting mix up the filling.
Mix the softened butter with the orange zest in a small bowl.
In another small bowl add the brown sugar and cinnamon.
Roll the dough out into a 14x8-inch rectangle. Spread the butter on top. Then sprinkle on the sugar mixture as evenly as possible. Roll up the dough to make a long log.
Cut 12 even rolls with a sharp knife.
Arrange the rolls in a greased 9" pie pan. Loosley cover the pan. Let them rise for 90 minutes in a warm place. They should have doubled in size.
Preheat the oven to 375℉
Bake for 25-27 minutes or until the rolls reach 190℉ on a thermometer.
While they are baking mix the icing ingredients together with a mixer.
When the rolls are done, move to a cooling rack and spread the icing all over the rolls whle they are still hot.
Eat right away or refrigerate for 3 days.
ENJOY!