 Oreo, America's favorite cookie. Nabisco's flagship combination of two wafer cookies and the all-important cream has been around for 102 years, defeated countless competitors, and become milk's best friend. Since 2012, there have been 35 variations of different Oreos on store shelves, everything from the overstuffed Mega Stuff to the kinda weird caramel apple. We've rounded up 18 of these flavors, as many as we've been able to get our hands on, and we're going to eat them all. We're gonna need some milk. In front of me I've got Classic Oreo, Double Stuff, Mega Stuff, Chocolate, Peanut Butter, Mint, Birthday Cake, Golden, Berry, Lemon, Banana Split, Reese's Peanut Butter Cup, Fruit Punch, Watermelon, Limeade, Root Beer Float, Caramel Apple, and Pumpkin Spice. 18 flavors, no repeats. You can group these Oreos into three different categories. You've got the Classics, the Fruits, and the Desserts, which is kinda meta given that Oreo cookies are already a dessert of sorts. In the Classics category we have the traditional Oreo, the Double Stuff, the Mega Stuff, Chocolate, Peanut Butter, Mint, and Golden. Out of these, my favorite is easily the Mega Stuff. The way the extra cream surrounds the cookie in your mouth just really can't be matched by the lesser versions. It's essentially a triple stuff, there's more cream than the double, but not quite as much as a quadruple stuff. Bonus points if you're able to double up the Mega with two cookies stacked on top of each other, but I warn, that's only for the brave. In the Fruits category we've got Berry, Lemon, Fruit Punch, Limeade, and Watermelon. None of these really taste like Oreos in the traditional sense, so it's hard to judge them against the rest of the field. They're really in their own category. The cream fillings in the fruit category tend to land somewhere between the Classic Oreo and the Double Stuff, but the creams themselves have a different texture than the standard white filling, it's almost gummy-like. Watermelon's an interesting proposition, it tastes like a cookie equivalent of a Jolly Rancher, which means it doesn't taste much like real watermelon, but it's more like the approximation of watermelon flavor that you only get with candy. It's pretty addictive. Now the most controversial and intriguing category of all is the desserts. Among the Oreos that we have, Banana Split, Reese's Peanut Butter Cup, Root Beer Float, Caramel Apple, Birthday Cake, and Pumpkin Spice all fall under the desserts banner. The desserts are the most ambitious Oreos, the ones that either shouldn't exist, or transcend the Oreo experience into something greater than it was before. Birthday Cake, Banana Split, and Pumpkin Spice are the weakest of this group, by a mile. Root Beer Float and Caramel Apple are interesting, if not totally remarkable. But the Reese's Peanut Butter Cup, this is something you wake up for in the morning. The Peanut Butter Cup Oreo skillfully combines the greatness of both Reese's candy and Oreo cookies into one perfect snack. The chocolate and peanut butter cream filling is just the right amount, and the flavors dance and mingle in just the right ways. I could eat a whole package of these without thinking twice or getting tired of them. And even though there are so many different Oreos out there, the eatability and repeatability of the Reese's Peanut Butter Cup Oreo makes it the one to beat. I could do a whole box of these.