In a food processor, process whole Oreo cookies until they are fine crumbs. In a medium bowl, combine crumbs and melted butter. Mix well to coat cookie crumbs with melted butter.
Press crumb mixture up the sides and onto the bottom of a deep dish pie plate; set in the freezer to firm up.
In a small bowl, combine the caramel bits and 1/4 cup whipping cream and microwave 1-minute at a time, stirring between sessions until the caramels are completely melted; stir well until smooth.
Pour melted caramel mixture into the bottom of the pie, on top of the crust. Return to freezer to set.
In a separate medium bowl, beat 2 cups of whipping cream until stiff peaks form; set aside.
Fold in the whipped cream and stir gently until combined.
Fold in 4 chopped Snickers bars until combined.
Scoop all of the filling ingredients into the pie plate on top of the caramel. Heap in the center and smooth all around. Return pie to freezer.
For the topping, in a medium bowl, combine chocolate chips and 1/3 cup heavy whipping cream. Microwave on high for 1 minute, stir. Continue microwaving 30 seconds and stirring until the chocolate is melted and the cream has been incorporated.