Mix together the sweetened condensed milk, white chocolate, and salt together in a medium saucepan and heat over medium-low heat until the chocolate melts. Remove from heat.
Add in the vanilla and stir in. Crush half the Oreos and stir it into the saucepan.
Pour everything into the prepared baking pan and smooth out.
Top with the remaining whole Oreos. (Optionally, you may roughly chop the Oreos before topping)
Chill the fudge for at least three hours, or until set. Cut into little squares.