Frito-Lay used the slogan “Betcha can’t eat just one” for Lay’s potato chips. The phrase challenged consumers to stop after eating a single chip, turning the snack’s appeal into the central idea of the advertising.
Lay’s is a potato-chip brand owned by Frito-Lay, the snack-food division of PepsiCo. The brand originated with Herman Lay, who began selling potato chips in the 1930s. Frito-Lay was formed in 1961 through the merger of The Frito Company and H. W. Lay & Company.
The slogan is a playful prediction rather than a nutritional or scientific claim. It has been adapted and translated in different markets, and Lay’s branding differs by country. The phrase is specifically associated with Lay’s potato chips, not with every product sold by Frito-Lay.