In a stand mixer mixing bowl, we’re going to add in our bread flour, white granulated sugar, table salt, instant yeast, milk powder, an egg at room temperature, + our tangzhong from earlier.
Put the mixing bowl onto the stand mixer and give it a quick few whisks then slowly add in your room temperature milk to the dough.
Now continue kneading the dough for 3-4 minutes then add in your room temperature butter.
Continue mixing it for an additional 9-10 minutes.
To check and see whether or not your dough has been sufficiently kneaded, grab a small piece of the dough and stretch it out with your fingers until it becomes somewhat translucent and you can see light passing through it.
If you do not see any rips or tears or very little, then your dough has been sufficiently kneaded.
Now transfer the dough to a greased large bowl.
Apply a little bit of oil to your hands and then shape the dough into a round ball.
Place it back into the bowl and cover it with plastic wrap or a towel and let it proof in a warm place until double in size, approximately 1 hour.
Once our dough has finished proofing, de-gase the dough and transfer it to a floured countertop.
Flatten the dough and then weigh it out on a scale.
Now divide it into 8 pieces and weigh out each piece so that you get equal portions.
Next, shape each piece into a round ball.
Once done, cover the dough with plastic wrap or a towel and let it rest for 15 minutes to relax the dough.
Once 15 minutes has passed, grab one piece of the dough and flatten it out. Now roll the dough out into an oval shape.
Then slowly roll the dough from one end to the other.
Now turn the dough over and pinch the ends of the dough to seal it.
Repeat this process for all of the other pieces.
Once done, place the buns onto a baking tray lined with parchment paper and cover the buns with plastic wrap or a towel and let it proof in a warm place for about 40 minutes.
While the buns are proofing, prepare an egg wash by whisking 1 egg together with a splash of milk.
Once done, set the egg wash aside and preheat your oven to 350°F (180°C).
Once the buns are finished proofing, apply the egg wash to the top of the buns.
Now bake the buns for 15-16 minutes at 350°F (180°C) or until the top of the buns is golden brown.