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, matcha powder, 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 2 pieces and weigh each piece.
Then shape each piece once again into a round ball.
Now cover the two pieces of dough with plastic wrap or a towel and let it rest for 20 minutes.
After 20 minutes take out 1 piece and roll it out into a long rectangle.
Then fold one end about 2/3 of the way inwards and then fold the other end 1/3 of the way inwards to cover the dough.
Now roll one end of the dough to the other end.
Then pinch the ends of the dough to seal it.
Repeat these steps for the second piece of dough.
Now grease a bread loaf pan with a lid and then place both pieces of dough inside of the pan with the short sides of the dough facing the short side of the pan. I'm using a 450g bread loaf pan here.
Cover the bread loaf pan now with either some plastic wrap or a towel and let it rise in a warm place until the dough is about 1 inch below the top of the pan.
Once the dough is risen about half way in the bread loaf pan, it's a good idea to preheat your oven to 400°F (200°C).
Once the dough is about 1 inch below the top of your pan, slid the lid into the bread loaf pan and then bake the bread in a preheated oven at 400°F (200°C) for 40 minutes.
Once the bread has finished baking, immediately take it out of the bread loaf pan and place the bread on a wire rack otherwise it will become soggy inside of the bread loaf pan.