INGREDIENTS
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1/2 cup unsalted butter, room temperature
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zest from 1 lemon
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zest from 1 orange
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1 cup powdered sugar
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1 large egg, room temperature
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1 tsp. vanilla extract
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2 cups cake flour (set aside 3 tbsp to toss with blueberries)
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2 tsp. baking powder
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1 tsp. salt
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1/4 cup coconut flakes
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2 cups fresh and firm blueberries
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1/2 cup buttermilk
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sugar for sprinkling