Spoon the softened ice-cream into the pie crust.
Freeze until firm, about 2 hours.
Top with the whipped topping, drizzle with chocolate syrup and chopped nuts if desired.
Freeze until solid, about 1 hour.
Slice and serve or keep frozen until ready to use. Allow to thaw for 5-10 minutes for easier slicing.

Note: To soften ice cream, break it up in bowl and stir with a wooden spoon. Do not let ice cream reach melting point.