There is a Cinnabon as you enter citywalk on the right side. Or you could keep breakfast type foods in your room to get you started then eat an early lunch.
At IOA in the Port of Entry there is Cinnabon and also a Croissant Moon Bakery and in Suess Landing: Green Eggs and Ham.
At Universal Studios there is the San Francisco Pastry Co. and Beverly Hills Bouangerie. There's also a Starbucks inside of Louie's but I'm not sure if it opens at park opening or not.
Croissant Moon bakery offers all kinds of bakwed goods, as well as croissant egg sandwiches (eggs, cheese, bacon, etc.). Fun spot to visit and to grab a table outside and soak up some early morning sun.