INGREDIENTS
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1/4 cup olive oil
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2 ounces (1/4 cup) salted butter
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2 large onions, very thinly vertically sliced (about 7 1/2 cups)
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3/4 teaspoon table salt
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1/2 teaspoon black pepper
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4 ounces cream cheese, softened
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1/2 cup sour cream
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1/2 cup mayonnaise, such as Hellmann's
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1 teaspoon Worcestershire sauce
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Potato chips, such as Ruffles