INGREDIENTS
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8 tablespoons (1 stick) unsalted butter, at room temperature, plus more for the pan
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1 cup granulated sugar
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2 large eggs
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1/2 cup unsweetened cocoa powder
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2 teaspoons baking powder
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1 teaspoon pure vanilla extract
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1/4 teaspoon kosher salt
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2 cups coarsely grated zucchini, from 1 large zucchini
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1 1/3 cups all-purpose flour, plus more for the pan
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1/2 cup semisweet chocolate chips