Nilla Wafers are a wafer-style cookies made by Nabisco, a subsidiary of Illinois-based Mondelēz International. . The name is a shortened version of vanilla, the flavor profile common to all Nilla-branded products in previous years. Originally marketed as Nabisco Vanilla Wafers, the product's name was changed in 1967 to the abbreviated form, Nilla Wafer. Originally a round, thin, light wafer cookie made with flour, sugar, shortening, eggs and real vanilla, Nilla wafers have been primarily flavored with synthetic vanillin since at least 1994, a change which prompted criticism.
https://en.wikipedia.org/wiki/Nilla_Wafers