INGREDIENTS
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1/4C unsalted butter, softened
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3 Tbsp granulated sugar
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3 Tbsp brown sugar
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1 tsp vanilla
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1 egg
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1/2C all purpose flour
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1/2 tsp salt
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1 tsp baking powder
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1/4 tsp baking soda
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1/4C sour cream
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1/4C milk
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1/4C unsweetened cocoa powder
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6 Tbsp unsalted butter, softened
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3C powdered sugar
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3/4 tsp vanilla
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2-3 Tbsp milk