INGREDIENTS
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3 1/3 cups bread flour
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1/3 cup white sugar
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2 teaspoons active dry yeast
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1 pinch salt
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3/4 cup milk, warmed
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2 eggs, separated
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2 tablespoons unsalted butter, melted
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1 teaspoon vegetable oil, or as needed
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1 cup cookie butter (such as Biscoff®), divided