Besides serving coffee, baked goods and pies, they also have basically everything else on the menu: ice cream, soups, salads, main dishes, sandwiches, pizza, juices, alcoholic drinks and sweats. Besides all of that, they have a special breakfast menu that you pay a fixed price for eating as much as you want.
Going to a bakery to have a real meal is one of the most normal things to do as a local. And this one is always full not only for its location (it is very central) and opening hours, but also because their food is freaking good. My favorites are the sandwiches which are delicious and big, so if you don't eat that much, it's enough for two.
There is always a line so be patient, it usually doesn't take much time.