INGREDIENTS
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1/2 cup unsalted butter (softened)
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1 cup granulated sugar
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2 eggs
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1 1/2 cups all-purpose flour
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1 1/2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup milk
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2 teaspoons vanilla extract
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1/2 cup blackberry puree
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1/2 cup unsalted butter (softened)
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3 cups confectioners' sugar
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1 teaspoon vanilla extract
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1/4 cup blackberry puree