Keoghan's Cheese and Onion crisps are a popular Irish snack known for their strong, savory cheese flavor perfectly balanced with the sharp tang of onion. While I don't have specific historical details for Keoghan's, cheese and onion has long been a classic crisp flavor, beloved for its comforting and satisfying taste. You should try them for an authentic taste of Irish crisps and a truly flavorful snack experience that's a step above typical potato chips.