Iowa State Center’s Executive Director, Tammy Koolbeck, presents special ruby red slipper Rice Krispies Treats to the Wizard of Oz cast before their performance. The legendary Rice Krispies Treats were invented by Iowa State University Alumnus Mildred Day and friend Malitta Jensen in 1939 while working for Kellogg’s. It took the pair nearly two weeks to perfect the recipe that would become the promotional vehicle for Rice Krispies cereal.