Preheat oven to 325°F.

Crush Oreo cookies for the crust.

Melt butter for the crust.

Stir together crushed Oreos and melted butter.

Press the mixture into a greased 9-inch pie pan.

Bake the crust for 10 minutes.

Cool the crust completely.

Soften vanilla ice cream.

Chop macadamia nuts for the filling.

In a large bowl, stir together softened ice cream and chopped macadamia nuts.

Pour the ice cream mixture into the cooled crust, mounding as needed.

Freeze the pie for at least 4 hours, or until very firm.

Prepare hot fudge sundae topping.

Chop macadamia nuts for topping.

Drizzle hot fudge sundae topping on the frozen pie.

Sprinkle chopped macadamia nuts over the topping.

Freeze again until ready to serve.

Cut into slices.

Serve each slice topped with whipped topping.

Garnish with additional macadamia nuts, if desired.