"Egg-enriched, yeasty dough is layered with sweet butter to make brioche feuilletee, which is French for flaky...."
INGREDIENTS
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2/3 cup whole milk
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1 envelope (1/4 ounce) active dry yeast (not rapid-rise)
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3 cups unbleached all-purpose flour, plus more for dusting
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3/4 cup unbleached bread flour
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1 tablespoon kosher salt
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1/3 cup sugar
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4 large eggs, room temperature, plus 1 egg, lightly beaten
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1/2 stick (4 tablespoons) unsalted butter, room temperature, cut into tablespoons, plus more for pans
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2 1/2 sticks (1 1/4 cups) cold unsalted butter