Combine all dry ingredients in a bowl of stand mixer fitted with a dough hook.
4 c all purpose flour, 1 tbsp instant yeast, ½ tsp Kosher salt
Whisk together milk, melted butter, egg and sugar in a medium mixing bowl until sugar has dissolved completely.
1 ¼ c whole milk, 3 oz unsalted butter, 1 medium egg, 4 tbsp sugar
On slow speed, add wet mixture into dry ingredients mixture gradually. Mix until the dough is smooth and starts pulling from the sides of the mixing dough completely. Scrape down the sides with rubber spatula if necessary.