INGREDIENTS
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2 cups all-purpose flour
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* 2 cups granulated sugar
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* 1 teaspoon baking soda
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* 1 cup unsalted butter
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* 1/4 cup unsweetened cocoa powder
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* 1 cup water
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* 1/2 cup buttermilk
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* 2 large eggs, lightly beaten
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* 1 teaspoon vanilla extract
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* 16 ounces (about 1 & 1/2 cups) creamy peanut butter
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* For the icing:
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* 1/2 cup unsalted butter
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* 1/3 cup buttermilk
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* 1/4 cup unsweetened cocoa powder
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* 16 ounces confectioners’ sugar, sifted
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* 1 teaspoon vanilla extract