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1
In a glass measuring cup, combine 1 cup warm water, the milk, yeast and sugar. Let stand until foamy, about 5 minutes. Meanwhile, beat 1 egg.
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2
In a large bowl, whisk flours with salt. Add butter and rub into flour between your fingers, making crumbs. Using a dough scraper, stir in yeast mixture and beaten egg until a dough forms. Scrape dough onto clean, unfloured counter and knead, scooping dough up, slapping it on counter and turning it, until smooth and elastic, 8 to 10 minutes.
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3
Shape dough into a ball and return it to bowl. Cover bowl with plastic wrap and let rise in a warm place until doubled in bulk, 1 to 2 hours.
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4
Line a baking sheet with parchment paper. Using dough scraper, divide dough into 8 equal parts. Gently roll each into a ball and arrange 2 to 3 inches apart on baking sheet. Cover loosely with a clean kitchen towel and let buns rise in a warm place for 1 to 2 hours.
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5
Set a large shallow pan of water on oven floor. Preheat oven to 400 degrees with rack in center. Beat remaining egg with 1 tablespoon water and brush some on top of buns. Bake, turning sheet halfway through baking, until tops are golden brown, about 15 minutes. Transfer to a rack to cool completely.
