"Refrigerator cookies are a busy baker's dream: an easy dough you can keep in the refrigerator for up to 2 weeks, slicing off and making cookies as you go...."
INGREDIENTS
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1/2 whole-wheat pastry flour
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1/2 all-purpose flour
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1/2 unsweetened cocoa powder
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1/4 baking soda
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1/4 salt
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3/4 packed light brown sugar
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1/2 granulated sugar
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6 cool unsalted butter
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1 large egg white
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1 vanilla extract