INGREDIENTS
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1-1/4 cups butter, softened
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1-1/2 cups sugar
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2 eggs
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1 teaspoon vanilla extract
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2-1/2 cups all-purpose flour
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3/4 cup baking cocoa
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1 teaspoon baking powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup sour cream or plain yogurt
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1 cup grated zucchini
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1 cup grated carrots