The Orginal Chex Party Mix Recipe History Chex cereal was first introduced in 1937 by Ralston Purina. By recipes for "Chex party mix" appeared on boxes of Chex cereal. Interestingly enough, the party mix was not trademarked until
Chex Mix, you know you want it, you know you love it and you can& get enough of the original Chex Mix recipe. Don& add the fancy ingredients, add the special salt and double up on seasoning with real butter.