INGREDIENTS
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1/2 cup (2.5 ounces) bleached all-purpose flour (dip and sweep method)
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1/2 teaspoon baking soda
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1/16 teaspoon salt (um, that’s a pinch)
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1/4 cup packed light brown sugar
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2 tablespoons granulated sugar, preferably superfine (or just blitz granulated sugar in a blender until finely ground but not powdery)
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4 tablespoons (2 ounces) unsalted butter, cold, cut into 1-inch cubes
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1/2 cup smooth peanut butter, preferably Jif, at room temperature
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1/2 large egg (beat the egg lightly before measuring out half of it, which ought to weigh .8 ounce)
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1/4 teaspoon vanilla extract