INGREDIENTS
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1 cup (130 grams) all purpose flour
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1/2 cup (50 grams) unsweetened cocoa powder
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1/4 teaspoon baking soda
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1/4 teaspoon salt
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3 tablespoons (45 grams) unsalted butter
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3 tablespoons (45 grams) margarine
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2/3 cup (140 grams) packed light brown sugar
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1/2 cup (100 grams) white granulated sugar
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1 teaspoon pure vanilla
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1 large (30 grams) egg white