Des Gateaux et du Pain is a very good bakery in Paris, they have very good quality bread but also delicious pastries! During Christmas season, they also have good Marrons glacés (candied chestnuts).
At Des Gateaux et du pain, you can find various type of breads and baguettes. They also have a good pastries offer. The pastries are in limited quantities so make sure to go there early to get what you want.
We recommend you to try the Rum Baba and the breakfast bread with dried fruits & raisins!
Rum Baba, Des Gateaux & du Pain