We can ask about the weather as in: what's the weather like? And food as in: what's the food like?
If you've bought some cookies and you want to ask your children whether they found them tasty or not, how do you ask them using the word like? Do you informally say: What 's the cookies like? OR what are the cookies like?
I could say did you find the cookies yummy? But I want to check whether like is used or could be used.
One more thing, informally I could say there's people at the door. Using is with plural in informal speech is okay. Is it the same here with cookies!?