Snickerdoodles, which is kind of funny because my mother never made them, ever. Other mothers always made them and I am not even sure if they are specific to the New England region.

Also, one thing which I have been surprised isn't made more outside of New England is corn chowder. Probably because corn chowder tends to be a things which New England Jews make because they don't eat clam chowder (at least my family did). And most other regions don't have the same concentration of seafood culture, cold and Jews.