INGREDIENTS
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1 cup all purpose flour, spooned and leveled
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1/2 teaspoon baking powder
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1/2 teaspoon baking soda
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1/4 teaspoon salt
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4 tablespoons (60g) unsalted butter, softened
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2/3 cup plus 1 1/2 tablespoons sugar
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1 large egg
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1 teaspoon vanilla extract
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1/2 cup buttermilk, room temperature
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1 1/4 cups blackberries
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Whipped cream for serving (optional)