INGREDIENTS
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1 cup all-purpose flour, sifted
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1 Tablespoon granulated sugar
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1/4 teaspoon salt
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1/2 teaspoon active dry yeast
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1/2 cup whole milk
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1/2 cup sparkling mineral water
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1/4 cup unsalted butter, melted and still warm
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1/2 teaspoon vanilla extract
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1 large egg yolk
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2 large egg whites
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pinch of cream of tartar