Best way to thank staff at a doctor's office?

I recently delivered and had the best doctors in the world (literally- they are known throughout the country). They were amazing in every way. I would like to show my appreciation to my doctors and the staff. I thought about baking cookies, sending flowers, etc. I’m not really into any of the ideas I thought of. It is a very busy office (it’s actually a center for diagnosis). Anyone have any ideas of how I can best thank them for everything they have done for me?
(In the past I have brought chocolates and other gifts to doctor’s and dentist offices. I liked doing that but, I would like to do something else, maybe something more personal, in this case). Thanks!