Into the bowl of a stand mixer fitted with a dough hook, add Active Dry Yeast (1 package) and Milk (3/4 cup). Mix, then let stand for 10 minutes.
Add Egg (4), All-Purpose Flour (4 1/2 cup), Granulated Sugar (1/4 cup), and Kosher Salt (1 1/2 teaspoon). Mix until smooth dough forms.
Add Unsalted Butter (6 tablespoon). Knead for about 7 minutes on low speed.
Turn dough out onto a lightly floured surface and knead a few times with your hands. Place into an oiled bowl. Cover and let rise for 1 1/2-2 hours.
Preheat oven to 400 degrees F (205 degrees C).
Into a mixing bowl, add Brown Sugar (2/3 cup) and Ground Cinnamon (2 teaspoon). Mix to combine.
Punch the dough down to release any air. Split it into two even halves. Roll each piece out into a 9 by 14-inch rectangle.
Spread dough with Unsalted Butter (4 tablespoon).
Roll up the dough and pinch the ends to seal. Cut each log in half, then into fourths. You should have 16 rolls in total.
Transfer rolls to greased 7 by 11-inch baking pans.
Bake for 15-20 minutes, until starting to turn golden brown.
Let cool, then cover in Cream Cheese Frosting (to taste) or frosting or glaze of choice.