It has not gone unnoticed that Dean takes care of everyone except himself. If he hasn't noticed, Cas' small gesture and frequent others are a result of Dean being the most caring human he knows past and present. Cas barely needs to consider accepting the job. "No." Is he ever kidding? "I will leave these with you and make more." Most likely right away if no one says anything. Lucy is a very skilled baker and it would be an honor to fill her shoes.

Being the resident baker would allow him to feel more useful. "Yes. Good enough to lose track of them."