<Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (August 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> Lay's Barbecue - flavored potato chips, which appeared in 1958, was the only flavor available in the United States other than the conventional salted chip until the introduction of Sour Cream & Onion in the late 1970s . </P> <P> In the United States, Lay's offers a number of flavor combinations, in addition to the classic chips . Flavored products in the traditional fried varieties include Sour Cream & Onion, Barbecue, Chipotle Ranch, Cheddar & Sour Cream, Hidden Valley Ranch, Salt & Pepper, Flamin' Hot, Limón, and a thicker "Deli style" chip . The WOW! brand was rebranded in 2004 as Lay's Light after the olestra formula was altered and the U.S. Food and Drug Administration allowed removal of warnings about various health consequences of the fat substitute . Other potato chip flavors offered by Lay's are Garden Tomato and Basil, Honey Barbecue, Sweet Southern Heat Barbecue, Tapatio Limon, Simply Sea Salt Thick Cut, and Dill Pickle Brand . </P>

When were sour cream and onion chips invented