This past holiday season Oreo issued a seasonal offering which they've been known to offer before: White Fudge Covered Oreo. If I'm not mistaken, this isn't the only type of Oreo that's been fudge covered, but it's really the only one to which you should pay attention.
The construction is quite simple: it's an Oreo cookie sandwich dipped in white chocolate. And, while the structural balance of the snack may not be ideal for my tastes, the flavor is quite good. I've been know to pan Oreo when they neglect the virtue of balance, and despite that this snack is simply an onslaught of sugar on the tongue, it works. The "fudge" overtop the Oreo sandwich is run-of-the mill white chocolate, so pure that its buttery flavor(mostly pure cocoa fat) doesn't interfere with the flavor of the chocolate cookie or vanilla creme.
I'll say it again, this is a victory on flavor, but not on anything else. Look toward Oreo's new Fudge Cremes snacks for a lesson in how to balance cookie, creme, and chocolate coatings.
White Fudge Covered Oreo:- Good
Original Oreo(for comparison):- Great