Oreo cookies are the best selling cookies in the 20th century, selling a whopping 500 billion cookies since their debut in 1912. The annual Oreo recipe calls for 18 million pounds of cocoa and 47 million pounds of its delicious cream filling. 

That delicious cream filling used to be made of pork fat, though. Oreos are obviously widely popular, which is why their slogan was “America’s favorite cookie.” They didn’t want to be too cocky about how good their cookies were, though, and switched their slogan to “Milk’s favorite cookie.” 

The Oreo sandwich is made up of 71% crème and 29% cookie. It was created by the National Biscuit Company, now know was Nabisco. Get it? NaBisCo! Anyways, it started in New York City, but their headquarters are now in New Jersey.

They’ve maintained their number one status as America’s favorite cookie in the 20th and into the 21st century. They have changed minor things to actually make the cookie somewhat healthier, like replacing its trans fat with non-hydrogenated vegetable oil. That is pretty cool.