National Lacy Oatmeal Cookie Day is celebrated every March 18th and highlights the unique characteristics of lacy oatmeal cookies, which are thin, crisp, and delicately patterned. These cookies are known for their toffee-like flavor, achieved through the caramelization of butter and sugar as the batter spreads during baking. The intricate, web-like texture is created by oats, resulting in a cookie that is both visually appealing and flavorful. Common customs include baking a batch of these cookies, hosting cookie exchanges to share different recipes, and pairing them with beverages like coffee or tea. Lacy oatmeal cookies can also be used creatively in desserts, such as ice cream sandwiches or as garnishes for cakes, showcasing their versatility and elegance.