A corn cookie is a cornbread-like cookie made with yellow ground cornmeal and corn kernels. Stick with white sugar, as brown sugar’s flavor may overpower the subtle corn flavor and slightly discolor the cookies. Stick with white sugar, as brown sugar’s flavor may overpower the subtle corn flavor and slightly discolor the cookies. How to Store Corn CookiesStore leftover corn cookies in an airtight container in the fridge for up to four days. Corn Cookies TipsEllie Crowley For Taste Of HomeCan you make corn cookies gluten free?