Kraft Foods now sells Oreos. They're the country's top selling cookie.
Pastry Chef Joanne Chang at Flour Bakery in Boston says the appeal of the Oreo is the way you eat it. There are so many options -- including dunking it in milk or twisting it to scrape off the filling with your teeth.
According to Kraft, 50 percent of Oreo eaters pull apart their cookies before eating. Women twist them open more often than men.
Like many bakers, Chang sells her own version of Oreos, using bittersweet chocolate with a filling using butter, confectionary sugar, vanilla and milk.
Over the years, Oreo has expanded on its original concept. In 1974, Double Stuff cookies were added with double the cream filling. Other flavors have been added, such as peanut butter, fudge, vanilla and mint.
Kraft says Oreo cookies are now available in more than 100 countries.