Fluffiest Cinnamon Rolls

1. In a small bowl, melt butter. Allow to cool slightly so that the temperature is around 110F. Add warmed milk, sugar and yeast. Whisk to combine.
2. In the bowl of a stand mixer fitted with the dough hook attachment, add milk mixture, egg, flour and salt. Mix until combined, then knead for 5 minutes.
3. Cover bowl with plastic wrap or a kitchen towel and allow to rise for 1 hour.
4. Roll out dough on a floured surface into a 14x9 inch rectangle. Spread softened butter over dough.
5. In a small bowl, mix together the brown sugar and cinnamon, then sprinkle over the dough. Starting from the 9-inch side, tightly roll up dough. Cut dough using serrated knife or unflavored dental floss into 9 rolls. Place in a lightly greased 8x8 pan. Cover with plastic wrap or a kitchen towel and allow to rise for 30 minutes.
6. Bake rolls in preheated 350F oven for 20 minutes.
7. To make frosting: Using a stand mixer or handheld mixer, beat cream cheese until fluffy. Add in powdered sugar and vanilla and mix to combine. Spread over warm rolls.