Tusker House used to have CS breakfast but after its rehab, it will be a character buffet. I'm thinking that Breakfastsaurus might go CS b'fst at that point, but don't know for certain.
Electric Umbrella at Epcot has a pretty good CS breakfast.
For MK, you can always have a CS b'fst at one of the monorail resorts and then zip into MK.