Also known as “secret ingredient oatmeal cookies” because Grandma would never tell us why her Oatmeal Chocolate Chip cookies were the best!! Thankfully, she told me recently and now I am able to replicate her amazing cookies for my kids!
Preheat oven to 350°F.
In medium bowl, beat brown sugar, mayo, egg, and vanilla for about 2 minutes. (You can use a hand-held mixer or stand mixer, but grandma recommends doing it by hand.) Set aside.
In a large bowl, combine oats, our, cinnamon, and baking soda.