In a medium size bowl add all but 2/3 cup of the crushed oreos. Stir in the melted butter.
Transfer the oreo and butter mixture to a 13x9” casserole dish, press into the pan.
Spread the softened ice cream over the crust and freeze for 2-3 hours.
Remove from the freezer and drizzle the warm fudge over the ice cream. Freeze 1 hour.
Add whipped topping over the fudge and spread into an even layer. Sprinkle remaining crushed Oreos overtop.
Freeze for 3-4 hours or overnight.
Serve!
Notes
*This recipe will feed a lot of people! It's rich, so you don't need a huge slice. Store covered in the freezer for 7 days. Add leftovers to a blender with some milk to make an Oreo milkshake!