I printed off my handy dandy dining plan location list and there is not much in the way of counter service breakfast. If you look that the menus it's mostly continental style breakfast which may be a snack item, not counter service.
I know of Starring Rolls in the Studios an the Main Street Bakery in MK.
The dining plan list has Fairfax Fair in the Studios too. Not sure where that is. Maybe someone else can chime in.
In Epcot there's Sunshine Seasons near Soarin'. We usually stop there for breakfast. Everyone in our party can get their own thing. It's cafeteria style food with lots of choices.
There's a few character breakfasts in the parks but you need to use a table credit for those.
HTH
Anybody else have ideas?