Which famous breakfast cereal was accidentally created when wheat dough was left out overnight and then processed through rollers anyway?

In the competitive world of breakfast cereals, product launches can make or break a brand's reputation. Some of the most successful cereal brands we know today actually began with entirely different products or formulations. This poll tests your knowledge about one of the most famous product pivots in breakfast food history. Do you know how one of America's favorite cereals came to be?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Kellogg's Corn Flakes
General Mills Cheerios
Post Grape-Nuts
Quaker Life Cereal