Waffle Crisp, hands down. You like cereal? You like waffles? Of course, who the hell doesn't.
Peanut Butter Puffins are a close second.
Also worth mentioning is Kashi GoLean Berry Crumble, for the simple fact that if you eat it for breakfast you WILL fart like an animal, all day long. My GF and I filled the whole house with stink when we first tried it. It's tasty but beware!