Line a 9x13 baking dish with parchment paper, making sure it goes up all sides.
Chop your Oreos in to good size pieces.
In a large non-stick stock pot, add the white chocolate chips and the condensed milk.
Stir over medium heat until everything is creamy and completely melted.
Remove from the heat and stir in the vanilla extract.
Stir in about 2/3 of your Oreo pieces.
Pour the fudge in to the parchment lined baking dish and use an offset spatula to quickly even it out from corner to corner.
Sprinkle the remaining 1/3 of the Oreo pieces over the top and press down gently.
Leave on the counter until it is room temperature, then place in the refrigerator until it's firm and ready to slice. (I usually leave mine overnight.)
Slice in to bite size pieces and serve!