Bloom the yeast. To do this, combine the water and milk, and heat the mixture to about 104℉. Stir in the yeast, cover it, and let it sit for about 10 minutes. It will bubble and foam up a bit if you did it right; if not, try again, you need the yeast to make the bread.
Combine your bread flour, salt, and sugar in your stand mixer's bowl.
Add the yeast mixture, and mix on low using the dough hook. This will come together into a dough ball; when it does, keep mixing/kneading for 2-3 more minutes.
Add in the butter a tablespoon at a time, letting it fully mix and knead in each time.
Continue kneading for another minute.
Transfer the dough ball to a lightly oiled bowl. Cover this and let rise in a warm environment for about 1-2 hours, or until doubled in size.
Grease your loaf pan and set it aside.
When the dough has risen, turn it out onto a lightly floured surface. Using a rolling pin, roll it out so it's the length of the loaf pan and about an inch thick, and as wide as it needs to be.
Roll the dough rectangle into a tube shape and place in the loaf pan, seam side down. Cover this with a damp towel and let rise again until doubled, about 45 minutes.
Preheat your oven to 350℉.
Bake the bread for 45 minutes, or until the top turns golden brown.
When baked, turn out onto a wire rack to cool. Slice and enjoy!