3/4 cups plus 2 tablespoons unsweetened cocoa powder (natural or Dutch-process)
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1/4 teaspoon salt
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1/2 teaspoon pure vanilla extract
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2 cold large eggs
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1/2 cup all-purpose flour (unsifted, measured by stirring briefly, spooning into the measuring cup until it's heaped above the rim, then leveling it with a straight-edged knife or spatula -- it should weigh nearly 5 ounces)