Crush your Oreos. Set aside 1/2 cup (approx 10 Oreos) for later use. Place the rest in a medium bowl.
Melt butter and add to Oreos in bowl. Mix Oreos and butter to create crust.
Line a 9x9 pan with parchment paper. Press 1/2 the Oreo crust into the bottom of the pan. Place the pan in the freezer.
In a large mixing bowl, pour the heavy whipping cream. Whip the cream until stiff peaks form.
Fold sweetened condensed milk into the whipped cream.
Fold reserved Oreos into the ice cream base.
Remove 9x9 pan from freezer and spread Oreo ice cream over the crust.
Return pan to freezer and allow ice cream to freeze for 2 hours.
Remove pan from freezer and press remaining Oreo crust into the top. Return pan to freezer and allow bars to freeze until solid, approximately 2 hours.
To serve, loosen bars from pan with a knife that has been run under hot water. Cut bars with hot knife and serve frozen.