INGREDIENTS
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1/2 cup (1 stick or 4 ounces) unsalted butter, softened
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1 cup (6 7/8 ounces) firmly packed light brown sugar
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1/2 cup (4 ounces) granulated sugar
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1 large egg, at room temperature
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1 cup buttermilk
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1 teaspoon vanilla extract
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1 1/2 cups (6 3/4 ounces) all-purpose flour
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3/4 cup (2 5/8 ounces) Dutch cocoa powder
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1/4 teaspoon baking soda
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1/2 teaspoon baking powder
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1/4 teaspoon salt