Oreo Cookie Cheesecake Day is observed worldwide every April 14, celebrating the delicious combination of cheesecake and Oreo cookies. This holiday highlights the iconic dessert, which features a crust made from crushed cookies and a soft cheese filling, often flavored with various ingredients. The modern cheesecake evolved in the 18th century, transitioning from cottage cheese to cream cheese after its invention in the 1870s. Oreo cookies, introduced by Nabisco in 1912, consist of two chocolate cookies with a sweet crème filling and have inspired numerous variations over the years. To celebrate, people often enjoy slices of Oreo cookie cheesecake, which can be purchased from bakeries or made at home, utilizing no-bake recipes. Oreo Cookie Cheesecake Day is one of several cheesecake-related holidays in the United States, having been established in 2020.