Which cereal brand was the first to launch single-serve, ready-to-eat cereal cups that didn't require milk to be added?

In the competitive world of breakfast cereals, one product launch changed how Americans viewed their morning meal forever. This seemingly simple innovation disrupted the entire cereal market and created a new category that continues to influence food product development today. Test your knowledge of this revolutionary breakfast breakthrough that combined health consciousness with convenience.

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Kellogg's Breakfast Mates (1998)
General Mills Breakfast Go-Packs (2001)
Post Cereals On-The-Go Cups (2003)
Quaker Oats Breakfast Squares (1999)