INGREDIENTS
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1/2 cup (1 stick) unsalted butter, melted and cooled
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1 cup sugar
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1 large egg
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24 walnut halves
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1 cup all-purpose flour
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1 cup finely grated zucchini (from 1 medium zucchini)
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1/4 cup unsweetened cocoa powder
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1/2 cup (3 ounces) bittersweet chocolate, chopped, or chocolate chips
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3 tablespoons sour cream
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1/2 teaspoon coarse salt
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1/2 teaspoon pure vanilla extract
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Nonstick cooking spray
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