Formal:
* A company of bakers (formal and traditional)
* A guild of bakers (emphasizing a professional organization)
Informal:
* A team of bakers
* A crew of bakers
* A group of bakers
* A bunch of bakers (more casual)
You could also use a more descriptive phrase like:
* A bustling bakery staff
* A talented team of pastry chefs
Ultimately, the best collective noun to use will depend on the specific situation and the tone you want to convey.