INGREDIENTS
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2 cups unbleached all-purpose flour
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1/3 cup plus 2 tablespoons sugar
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/2 teaspoon salt
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6 tablespoons (3/4 stick) chilled unsalted butter, diced
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1 teaspoon (packed) grated lemon peel
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3/4 cup miniature semisweet chocolate chips
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3/4 cup chilled buttermilk
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1 large egg yolk
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1 teaspoon vanilla extract
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Milk (for glaze)