Depends on what time your breakfast is. If it's before park opening, there's a specially marked gate you check in to one side, and they'll take you over there.
I like booking Minnie and Friends at 10:30 on an early opening. We eat something like a breakfast bar or get Starbucks, when we rope drop the park and tour for an hour or two, then treating the character breakfast like brunch or early lunch. There's a great article on tips and stuff here:
https://disneylanddaily.com/a-complete-guide-to-character-meals-at-disneyland-resort/