In a kitcehnaid mixer with the paddle, mix 2 cups flour, the sugar, yeast and salt on low.
In a microwave safe bowl, combine water, milk, and butter and heat to 120°-130°F.
Pour this into the flour mixture and add the egg, beating 2 mins on medium.
Add 2 more cups of flour and switch to high speed 2 mins.
Turn mixer to low and add in just enough remaining flour until the dough will form a ball. (I needed only 1/2 c. more.)
Knead the dough on a floured surface 6-8 minutes, adding flour as needed.
Cover dough with a towel and let it rest for 10 minutes.