INGREDIENTS
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2 tablespoons unsalted butter
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3 medium onions, halved and thinly sliced
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1 1/2 cups sour cream, at room temperature
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1/2 pound cream cheese, softened
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1 tablespoon finely chopped flat-leaf parsley
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1/2 teaspoon onion powder
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1/2 teaspoon Worcestershire sauce
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Kosher salt and freshly ground pepper
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Potato chips, for serving