INGREDIENTS
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Vanilla dough:
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1 cup salted butter, softened
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1 cup icing sugar
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1 large egg, separated
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1 tsp vanilla
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2 1/4 cups all-purpose flour
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Chocolate dough:
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1 cup salted butter, softened
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1 cup icing sugar
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1 large egg, separated
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2 cups all-purpose flour
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1/4 cup unsweetened cocoa powder