Make crust: In a food processor, pulse Oreos until they are fine crumbs. Transfer crumbs to a bowl, then add butter and sugar and stir until combined. The texture should be similar to wet sand.

Grease a 9" pie plate and press in the crust mixture.

In a large bowl using a hand mixer, beat cream cheese until light and fluffy. Add powdered sugar, chocolate sauce, cocoa packets and salt and mix until smooth

Add about half of the heavy cream and beat until smooth. Add the rest of the heavy cream and beat until very fluffy.

Fold in mini marshmallows. Pour cheesecake mixture into the prepared crust.

Freeze until solid, about 4 hours.