Which popular snack food was originally developed as part of military K-rations during WWII and later became a mainstream consumer product?

Many everyday products we take for granted actually originated as military innovations. From canned food to microwave ovens, the military has played a surprising role in consumer product development. This trivia question focuses on one such famous crossover from military rations to civilian supermarket shelves. Test your knowledge about how wartime necessity became peacetime convenience!

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M&M's chocolate candies
Lay's potato chips
Cheerios cereal
Jell-O gelatin dessert