INGREDIENTS
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1/2 cup unsalted butter
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3/4 cup strong brewed coffee
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1/2 cup dark chocolate cocoa powder
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1 tsp vanilla extract
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1 Tbsp espresso powder
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1 cup flour
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1 cup sugar
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3/4 tsp baking powder
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1/4 tsp salt
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1 egg
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1/2 cup sour cream
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Chocolate Fudge Frosting
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½ cup unsalted butter, room temperature
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4 1oz squares baking chocolate
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1 lb sifted powdered sugar
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1 tsp vanilla
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½ cup whipping cream