INGREDIENTS
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1 egg
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1/2 teaspoon vanilla extract
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6 tablespoons sour cream
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1/4 cup milk
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1/4 cup vegetable oil
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1/2 cup Imperial Sugar (white granulated sugar)
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1 cup flour
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1/4 cup cocoa powder
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1/2 teaspoon baking soda
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2 1/2 Tablespoons butter
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1 cup powdered sugar
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3/4 teaspoon vanilla extract
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2-4 Tablespoons hot water