INGREDIENTS
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1 cup unsalted butter, softened
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1 cup white sugar
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2 large eggs
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2 cups all-purpose flour
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1 1/4 cups dark chocolate/special dark cocoa powder
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1/2 teaspoon baking soda
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Cream Filling:
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1/2 cup butter, softened
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2 cups powdered sugar
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1 teaspoon vanilla