If you're looking for authentic Mexican pan dulce. You have to go to Pan & Pasteleria San Sebastian. They have fresh sweet Mexican bread daily, and make custom order cakes. This small bakery has a HUGE variety of pan dulce.
My family and I always make sure to come every Sunday, as they are open 7 days a week until 9pm. Make sure to grab some "conchas and ginger puerquitos" as they do not compare to any pan dulce around the valley.