INGREDIENTS
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1 stick unsalted butter, at room temperature
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1 cups sugar
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2 large eggs, at room temperature
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1 1/2 teaspoons pure vanilla
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8 ounces (about 1 cup) sour cream
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3 cups all-purpose flour
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2 teaspoons baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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2 cups fresh blueberries, reserve (if you use frozen thaw and drain well)
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1/2 cup blueberries
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1/4 cup course sugar