Place chocolate pieces into a double boiler or mixing bowl set over a pot of simmering water and pour sweet condensed milk over them. Heat over medium heat until melted.
In a separate bowl, add crushed Oreos and mix in the melted white chocolate. Line an 8-inch square pan with wax paper and pour in fudge mixture. Top with extra Oreos.
Place in fridge until chilled/cooled to preferred texture. Cut squares out and enjoy!