2
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⅓ cup all-purpose flour (such as King Arthur) (about 11 3/8 ounces), plus more for dusting
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1 tablespoon baking powder
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1 teaspoon granulated sugar
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1 teaspoon fine sea salt
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½ teaspoon baking soda
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2 tablespoons vegetable shortening (about 3/4 ounces)
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½ cup unsalted butter (4 ounces), frozen or very cold
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Cooking spray
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1 ⅓ cup buttermilk, chilled (or substitute 1 cup low-fat buttermilk plus 1/3 cup sour cream)