National Oatmeal Cookie Day is observed worldwide on April 30 every year. This holiday celebrates the deliciousness of oatmeal cookies, which are often enjoyed crispy or chewy alongside a glass of milk. Oatmeal cookies are considered a healthier alternative to regular cookies and can be customized with ingredients such as raisins, nuts, or chocolate chips. The origins of oatmeal cookies date back to the 1800s, evolving from oatmeal cakes that provided energy for soldiers. The first recorded recipe for oatmeal cookies was written by Fannie Merrit Farmer in 1896, contributing to their popularity in the early 1900s, a trend that continues today. To celebrate National Oatmeal Cookie Day, many people bake their favorite oatmeal cookie recipes.