Spread softened chocolate ice cream evenly over crust to the edge of the crust, touching cookie sides.
Place in freezer for 30 minutes.
After 15 minutes, set vanilla ice cream out to soften, if needed.
Spread softened vanilla ice cream evenly over chocolate and spread to the edge of the crust, touching cookie sides.
Heat 1-2 tablespoons of fudge sauce for 15 seconds in the microwave. Drizzle lightly over vanilla ice cream.
Sprinkle chopped nuts around outside border of vanilla ice cream.
Cover with foil and place in freezer for at least 30 minutes or until ice cream is firm and ready to serve.
Remove the ice cream cake from the freezer 10 minutes before ready to serve.