INGREDIENTS
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Yield: about 40 (2-inch) cookies
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Active Time: 30 Minutes
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Total Time: 1 hours
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Ingredients
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5 ounces bittersweet chocolate (60-75% cacao), divided
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2 tablespoons unsweetened cocoa powder (preferably Dutch-process), sifted after measuring if lumpy
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3 tablespoons cocoa nibs, (see Shopping Tip), optional
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1/3 cup egg whites (about 3 large), at room temperature
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1/2 teaspoon cream of tartar
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1/2 cup sugar, divided (use 1 1/2 teaspoons less if cocoa nibs are omitted)
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1/2 teaspoon vanilla extract