What breakfast cereal was once marketed as "The talking cereal"?

Originally marketed as “The Talking Cereal” when it was first released in 1928 due to the sound it made when milk was added, Rice Krispies’ more familiar “Snap! Crackle! Pop!” slogan quickly debuted a year later. The puffed rice cereal remains a top seller in the U.S. nine decades later, though Rice Krispies sales slipped nearly 5% for the year ended Aug. 12. Units sold dropped, too, by almost 4% year-over-year, and the average price per unit declined by 4 cents. The core cereal brand still managed to add $136.7 million to Kellogg's top line. Rice Krispies Treats, meanwhile, are a key contributor to the company's U.S. Snacks division.

Source: Kiplinger