A cookie consists of 2 round biscuits with a cream filling.
- The original design of the cookie featured a wreath around the edge of the cookie and the name "OREO" in the center. In the US, they were sold for 25 cents a pound in novelty cans with clear glass tops.
- The Oreo Biscuit was renamed in 1921, to 'Oreo Sandwich'. A new design for the cookie was introduced in 1924. A lemon-filled variety was available briefly during the 1920s, but was discontinued.
- In 1948, the Oreo Sandwich was renamed the "Oreo Creme Sandwich" and was changed in to the Oreo Chocolate Sandwich Cookie in 1974.
- The modern-day Oreo design was developed in 1952 by William A. Turnier, to include the Nabisco logo.
The modern Oreo cookie filling was developed by Nabisco's principal food scientist, Sam Porcello. Porcello held five patents directly related to his work on the Oreo. He also created a line of Oreos covered in dark chocolate and white chocolate. Porcello retired from Nabisco in 1993.