Where will you be coming from? One of the DLR hotels? From the parking structure? Are you trying for rope drop? (& what time does the park open at?). Are you looking for a quick/counter service or a table service place? Surfside Lounge is at PPH, so not that close to the entrance to the park. Haven't eaten there, so can't comment on breakfast.
We like grabbing breakfast at White Water Snacks at GCH, but sometimes it's not open early enough for us to get to the park early for RD.
https://disneyland.disney.go.com/dining/grand-californian-hotel/white-water-snacks/menus/
But, it's really close to the GCH's entrance to DCA, which is handy (if you're staying at a DLR hotel. Otherwise, you might not be able to use that entrance until after 11AM from what I've read). My kids like the mini Mickey waffles and the French toast (more like French toast fingers that are fried?), both come with a side of grapes. They also have breakfast burritos too.
Coming from DTD side, there's always Starbucks (open really early-5AM!-unlike the rest of DTD). La Brea Bakery also has an Express. Or perhaps Jazz Kitchen Express?
https://disneyland.disney.go.com/di...ct/ralph-brennans-jazz-kitchen-express/menus/