In the bowl of a stand mixer with the dough hook attached, stir together 3/4 cup flour, yeast, sugar, and salt.
In a separate small bowl, mix milk, butter, and water. Microwave 15 seconds at a time until liquid is very hot, but not scalding - about 120 - 130 degrees, I usually just test it with my finger. *Note: butter will not be completely melted.
Pour this into the mixer bowl and turn on medium speed, scraping the sides, until you have very wet dough. Next, add an additional 1 1/4 - 1 3/4 cup flour until the dough cleans the sides of the bowl and it comes together in a ball.
Set your mixer on medium speed and set the timer for 8 minutes allowing it to knead the dough. Transfer dough to a separate bowl, cover with plastic wrap, and allow to rest 10 minutes.
Cut dough into 12 equal balls and place in a greased square baking dish. Cover and set in a warm place for 30 minutes or until doubled in size.
Brush tops with beaten egg. Combine sugar and cinnamon and sprinkle evenly over the tops of the rolls. Bake at 375 degrees for 20 minutes.
Drizzle melted butter over rolls and allow to cool, at least slightly, before serving.