Crush up the Oreos into fine crumbs using a food processor.
Add the butter and pulse until blended in.
Press the crumbs into a 9-inch pie plate.
Set Aside.
Measure chocolate chips into a microwave-safe bowl or measuring cup.
Add ½ cup heavy cream and salt.
Microwave for 20 to 30 seconds at a time to melt the chips, and the mixture whisks smoothly together.
Heat only enough to just melt the chips. If you overheat, the chocolate can scorch. Also, heating more than necessary makes it take forever to cool.
Cool to room temperature. You can speed this up by placing the container in the fridge or freezer for a few minutes, stirring here and there to cool faster. Keep an eye on it though, because you don't want it to become too cold.
In a small bowl, whip 1 cup of cream, vanilla, and ⅛ cup of powdered sugar until stiff peaks form.
Carefully fold the whipped cream into the chocolate mixture.
Pour into the Oreo pie shell and chill for at least 6 hours.
Top with additional whipped cream, chocolate shavings, or jimmies if desired.