Yum Yum Donuts is a Southern California institution. It was the first donut shop to stay open 24 hours and bake its pastries on the premises. There's always a supply of fresh donuts, including cake, glazed, and cream- and fruit-filled options, with an assortment of icings and sprinkles. The bakery recently added breakfast sandwiches to its menu, such as bagels and croissants filled with eggs, bacon or sausage. Fresh brewed coffee, soft drinks, juice and milk are also available.This Yum Yum is located in the Marathon Plaza shopping center.