Oats on Os! Start your day with the irresistible crunch of Cheerios Oat Crunch Cinnamon breakfast cereal. This sweetened multigrain cereal is made with whole grain oats and topped with real cinnamon for a tasty part of an easy breakfast. Cheerios Oat Crunch Cinnamon delivers a hearty bite in each bowl combining sweetened multigrain cereal and visible bunches of oats that bring a crunchy texture to each spoonful.