At AK: Yak and Yeti QS has breakfast items - Egg white English muffin, Sausage and Egg English Muffin, Breakfast Bowl
At AK: Kusafiri Coffee Shop has Muffins, Croissant, Breakfast pastries
At AK: Starbucks has breakfast sandwiches.
At Epcot: Depending on what time the park opens, the shop in France has many breakfast items, Joffrey Stands have pastries and donuts. Garden Grill is open for breakfast (I think) if you want a TS and Sunshine Seasons has grab and go things. Lately the earliest park hours for Epcot have been 10 am. You could easily go to any of the resorts behind WS for breakfast, there are a number of good places to eat breakfast at Swan/Dolphin.