It's getting more and more difficult to do without really hurrying through breakfast.
Assuming 9am park openings (which is not always the case at each park - particularly AK this summer):
Tuskerhouse at AK
BOG at MK
Akershus at Epcot
Hollywood & Vine at Hollywood Studios
Breakfast isn't the best bang for your $, but if you want to knock out some characters and fill up, it may be the way to go.
Shoot for 8am (or as close to that as you can) reservations and show up EARLY so that you not only have the 8am reservation but that you are first in line (or close to it). They really seat those places in waves, so if an 8:10 reservation shows up at 8am right before an 8:05am reservation, they will seat the 8:10 party immediately followed by the 8:05 party.
Also, it is pointless to have an 8:30am (or later) reservation if elite rides/attractions are the reason you are doing the breakfast. You will still be sitting in the restaurant while lines fill up.