INGREDIENTS
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1/2 cup butter, at room temperature 1 cup granulated sugar 3 large eggs, divided (1 egg, 2 yolks, and 2 egg whites) 1 teaspoon vanilla extract (I added this) 1 1/2 cups all-purpose flour 1 teaspoon baking powder 1/4 teaspoon salt 1/2 cup semi-sweet c