In Bulgarian, they are is са ( pronounced "sа"), also.
As Arthur pointed out below, there are broadly similar sounds for "they are" in French, Spanish (which I knew / know) and old Russian (which I didn't.)
I might add that in Romanian, sunt means "they are" (it means I am, too.)
If anything else comes to mind, I'll let you know :-) :-) :-)
So you couldn't simply walk up to your coworkers and exclaim, "Są ciasteczka!"? :D
What would I say if I simply wanted to announce that there are cookies? Would I have to include the location in the sentence? (Of course, in English I'd probably include the location too, but not always.)
I could, but I think it's generally easier for everyone if you use Wiktionary ;) It should have almost all the conjugations and declensions for the words in this course. https://en.wiktionary.org/wiki/by%C4%87#Verb
The -m, -ś, -śmy, -ście in the table - right now you can disregard those, that's also a possibility in many sentences but it's out of the scope of this course.