When my son started out on solids, we mainly gave him Cheerios as his snack. As he has grown and tried new foods, Cheerios are more fun for him to throw than to actually eat. With this in mind, we have a large box of Cheerios that has been sitting in the pantry because my husband and I do not eat them much.
I decided to try a different approach and use up some of the Cheerios. I put the cheerios in a bowl and then I smashed them into fine pieces. I have also read that an easier way to smash the cereal is by putting it in a sandwich bag and using a rolling pin.