INGREDIENTS
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SPONGE
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•1/3 cup warm whole milk
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•2 1/4 teaspoon active dry yeast
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•1 large egg
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•2 cups unbleached flour
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DOUGH
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•1/3 cup sugar
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•1 1/2 teaspoons kosher salt
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•4 large eggs, lightly beaten at room temperature
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•1 1/2 cups flour
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•12 tablespoons unsalted butter, room temperature