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¾ cup whole-wheat pastry flour |
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¾ cup unsweetened cocoa powder (not Dutch-process) |
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1 ½ teaspoons baking powder |
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1 ½ teaspoons baking soda |
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1 teaspoon pumpkin pie spice |
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1 15-ounce can unsweetened pumpkin puree |
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¾ cup packed dark brown sugar |
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1 large egg, at room temperature (see Tip) |
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1 large egg white, at room temperature |
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1 tablespoon vanilla extract |
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½ cup packed confectioners' sugar |
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1 tablespoon nonfat buttermilk |
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2 tablespoons mini chocolate chips or toasted chopped nuts (see Tip) |
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