Gather your ingredients so that you have everything close at hand on the counter or table.
Prepare the Dough
In a small saucepan, heat the whole milk with butter until the butter begins to melt. Remove from heat.
In a large mixing bowl with an attached dough hook, combine 3 cups of all-purpose flour, onion soup mix, granulated sugar, instant yeast, and kosher salt.
Add in the lukewarm milk mixture. Stir in the large beaten egg until combined.
Turn out onto a floured surface and add the remaining flour. Knead until smooth and silky, 5-7 minutes.
Place in a greased bowl. Cover and allow to rise until double, approximately 60-90 minutes.
Form and Bake the Bread
Preheat oven with baking stone to 350℉. Punch down dough. Cut into two pieces and form into mounds.
Place on parchment paper. Cover with cotton dish towel and allow to rise for 30-40 minutes until double. (Alternately, you may place dough in two large bread pans.)
Prepare Egg Wash and Topping
In a small bowl, mix together the egg and water to make an egg wash.
Brush each loaf with the beaten egg wash and sprinkle with sesame seeds.
Using a pizza peel, transfer each loaf on parchment paper to the baking stone in the preheated oven. Bake for 35-40 minutes until golden brown. Makes 2 rustic loaves.
Notes
*Unless otherwise indicated, all butter used on this recipe site is salted.