Combine dry ingredients - Add the bread flour, salt, sugar, instant dry yeast and milk powder to the bowl of a stand mixer fitted with a dough hook. Mix until well combined, about 20 seconds. I usually do this by hand using the dough hook attachment.
Add wet ingredients - Add the Tangzhong, milk, and egg. Mix until a dough forms. Then add the softened butter and mix until fully combined. Continue mixing for 10 minutes on low speed. The dough will be sticky at first, but keep kneading for the full 10 minutes, and it will gradually become smooth and less sticky.
First rise - cover with plastic wrap or a lid and allow to rest in the fridge overnight for a tastier bread, OR if you don’t in a warm spot for 1-2 hours or until it’s doubled in size. If the dough was in the fridge, let it sit at room temperature for 30 minutes before shaping.
Prepare loaf tin - for this recipe you’ll need a 22 x 10cm / 9 x 4-inch loaf tin that is 10cm / 4-inches in height. You can use a smaller loaf tin that is slightly wider like a tin you use for banana bread. Spray the bottom and sides with oil spray or brush with melted butter.
Divide the dough - Dust your workbench with flour and pour the risen dough onto the bench. Knead a little to form a large ball. Divide the dough into 3 even sized portions. The easiest way is to weigh your dough using kitchen scales and divide that number by 3. You can also eyeball it if you like.
To form dough balls - Roll each piece of dough into a 20 x 10cm / 8 x 4-inch rectangle. Fold the left and right sides of the dough into the center so they meet in the middle.
How to roll the dough - Starting from one of the short edges, roll the dough tightly into a log. As you reach the end of the roll, make the last part of the dough slightly wider than the beginning by gently stretching outward. This helps the bread rise evenly and prevents any layers from showing through the top. Pinch the seam along the edge to seal.
Second rise - Loosely cover the tin with lightly oiled plastic wrap to prevent sticking and let it rise in a warm spot for 1 hour or until doubled in size.
Bake - 15 minutes before you’re ready to bake, preheat a fan forced oven to 180C/355F (200C/400F for no fan). After rising, brush with egg wash and bake on the middle rack for 30-35 minutes until golden brown. You’ll know your bread’s done when it’s golden brown and sounds hollow when tapped on the top. Don’t worry, it’s not as weird as it sounds—just give it a little knock!
Once baked - let it cool for 10 minutes before transferring to a cooling rack to cool completely. Let the bread cool before slicing to keep it fluffy. Just above room temperature is fine.