INGREDIENTS
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1 cup sugar
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2/3 cup all purpose flour
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1/3 cup cake flour
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1 egg
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1/2 teaspoon baking soda
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1/2 cup sour cream
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1/2 cup butter, melted
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1/2 cup water
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1/3 cup creamy peanut butter
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FOR THE ICING
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1/3 cup creamy peanut butter
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3 tablespoons milk
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2 cups powdered sugar
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2 teaspoons vanilla
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1/4 cup butter