Grape-Nuts O's
You know what puffed rice is right? Well, this is like puffed Grape-Nuts. After puffing, or whatever it is they do, they squish them into an "o" shape, add some sweetener, and voila, new cereal.
As opposed to normal Grape-Nuts you can actually eat more than 5 tablespoons of the stuff, a whole bowl even.