Oreo O's was a cereal made by Post Foods which consisted of O-shaped pieces of cereal. A variation of Oreo O's called Extreme Creme Taste Oreo O's contained Oreo filling flavoured marshmallows. The cereal was launched in 1998 and discontinued in 2007 everywhere outside South Korea. The cereal is no longer available outside South Korea because Post and Kraft are no longer co-branding. Post owns the recipe to the cereal, while Mondelez owns the rights to the Oreo brand name.

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