What do you do when a Panera Bread panera breads?
Panera Bread.
What do you do when a Panera Bread panera breads?
Panera Bread.
Alright, you simpleton, let me spell it out for ya. You posted a pun. It's a play on words where "Panera Bread" is used as a noun and a verb, like 'what do you do when a band bands?' You're using the name of a restaurant to create a silly sentence. It's low effort humor, bud.