They do have the Mickey waffles even though they are not on the menu. As far as cereal goes, I kind of doubt that. Just tell the server that your kids will only eat the waffles, other wise they only bring 1 person and then you will have to request more.
The breakfast is fantastic, they give you a ton of beautiful fresh fruit and juice. Also, there is this awesome bread. It's pineapple coconut I think.
My feeling is even a picky eater would be fine here.