INGREDIENTS
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2 1/4 cups all-purpose flour
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1 teaspoon baking powder
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1/4 teaspoon baking soda
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1/2 teaspoon salt
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8 tablespoons (1 stick) unsalted butter, at room temperature, plus more for pan
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1 cup sugar
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2 large eggs
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4 ounces semisweet chocolate, melted, slightly cooled
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1 teaspoon vanilla extract
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1/2 cup buttermilk
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1 cup grated zucchini (from about half a medium zucchini)
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Confectioners' sugar, for dusting, optional