To start, we’re going to make our Tangzhong. In a small sauce pan, add in your bread flour and water.
Heat the mixture over low heat while constantly stirring it until the Tangzhong becomes a thick paste.
Remove it from the stove, cover it with plastic wrap and store in the fridge for at least 20 minutes to allow the Tangzhong to cool down.
Next, in a large mixing bowl, add in your bread flour, sugar, salt, instant yeast, milk powder, 1 egg, and the Tangzhong from earlier.
Now using a stand mixer, give the dough mixture a quick few whisks then slowly add in your milk.
Continue mixing everything for 3-4 minutes then add in your room temperature butter.
Continue mixing everything for an additional 9-10 minutes or until the dough becomes nice and smooth.
You can check when the dough is done kneading by grabbing a small piece of the dough and stretching it out until light can pass through it and it becomes translucent. If it doesn’t tear then it is ready.
Then transfer the dough to a greased large bowl.
Add some oil to your hands to prevent the dough from sticking to it and then shape the dough into a round ball and place it back into the bowl.
Cover the bowl with plastic wrap or a towel and then let it proof in a warm place until double in size (about 1 hour).
Once the dough is done proofing, de-gase it and transfer it to your countertop.
Shape it into a round ball and then weigh out the dough.
Next, divide the dough into 10 pieces.
Weigh each piece and then shape each piece of dough into a round ball.
Cover the dough to prevent it from drying out and then let it rest for 10-15 minutes to relax the dough.
Then after 10-15 minutes, take out each piece of dough, add some flour to it and roll out the dough into a rectangle.
Press down on the edges of one end of the wide end of the dough then roll the other end over to form a log.
Pinch the ends to seal it and then roll out the log until it is around 6 inches long.
Place each piece of dough onto a baking tray lined with parchment paper about 1-2 cm apart from each other. Cover the dough and let it rise in a warm place for 40-45 minutes.
After the dough has finished proofing, apply an egg wash to the top of each piece of dough by beating together 1 egg and a tsp of milk.
Bake the buns in a preheated oven at 350°F (180°C) for 16-17 minutes or until the bun is golden brown on the middle rack.
While the buns are baking, prepare a sugar glaze by adding 1 tsp of white granulated sugar + 1 tsp of water to a small sauce pan. Heat this over low heat while constantly stirring the sugar glaze until it melts and turns into a liquid. Remove it from the stove once it has turned into a liquid.
Now brush the sugar glaze liberally over the top of the baked Windsor bread and enjoy!