INGREDIENTS
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8 oz. sour cream
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1/4 c. milk
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2 c. butter, softened and divided
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2 c. sugar
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4 eggs
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2 t. vanilla extract, divided
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2-3/4 c. all-purpose flour
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2 t. baking powder
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1/2 t. salt
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2 c. dark brown sugar, packed
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1/4 c. plus 2 T. whipping cream
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3-3/4 c. powdered sugar