What is this in cookie recipe joke?

In http://www.jumbojoke.com/chocolate_chip_cookies_for_scientists_1559.html what is item 7 intended to be?? I can figure out the rest (although flour isn’t just gluten, so I don’t quite agree with 1).

WAG. Vanilla flavoring.

Vanillin, or methyl-protocatechuic aldehyde, C6H3OHOCH3COH, is the odorous principle of vanilla pods.

Thanks. I thought after I posted that maybe that was what was missing in the recipe, but not being much of a cook I wasn’t sure.