The only EPCOT sitdown I can think of is PSB (Princess Storybook Breakfast) in Norway. Apparently that is getting as tough as CRT's to book these days.
Food is ok, it was terrible the first time we went, better last time, but still mediocre for $19.99 a person. The princesses are at this breakfast.
Otherwise I think breakfast at EPCOT is available through select counter service restaurants in FW.
I don't believe B&C serves breakfast. YCG is a nice quiet place to grab a fairly quick breakfast though.