INGREDIENTS
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1 2/3 cup cake flour
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3/4 tsp baking powder
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1/4 tsp baking soda
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1/2 tsp salt
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3/4 cup + 2 Tbsp granulated sugar
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1/2 cup unsalted butter, softened*
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1 large egg
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2 large egg whites
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1 tsp vanilla extract
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1/4 cup buttermilk
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1/3 cup sour cream
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1 1/4 cups fresh blueberries, plus more for topping
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8 oz cream cheese, softened
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1/2 cup butter, softened (I prefer 1/4 cup unsalted and 1/4 cup salted)
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1/2 tsp vanilla extract
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2 cups powdered sugar