My thought is to contact the shelters first to see if you could bring cakes, cookies there and then if they say yes they will probably tell you how many servings they would need you to bring. I would think they'd want you to be licensed if it's a homemade good but like I said I think contacting the shelter would be the best thing.
From the Red Cross website:
Why does the Red Cross discourage donations of collected goods and individual items for disaster relief?
Collections of items require valuable and scarce resources such as time, money, and personnel to sort, clean, and distribute them, which come at the expense of the emergency activities relief workers are attempting to perform. The Red Cross has neither the resources, nor the logistical set-up, to properly handle these types of donations, and therefore cannot accept them.
In addition, because the organization has no way of knowing what spontaneous individual donations or unsolicited collections of items will consist of, and therefore cannot ensure there will be enough of a particular item to distribute it equitably, or if the donated products will even be appropriate for the relief effort.
Where can donations of collected goods and individual items be most effective?
Individual donations of goods and collections of items are put to their best possible use, and have the greatest impact economically, when they are donated to local charitable organizations within the local community. Donating locally eliminates transportation costs and ensures disaster workers are not overwhelmed with sorting unsolicited donations and are free to perform priority relief activities. Because these local agencies are not operating in the crisis environment that characterizes disaster relief, the charity will have the time sort, clean, and repair goods and identify how and where they can be most beneficial.