Pour half and half into large bowl.Add pie filling mix.Beat with wire whisk until well blended, about 1 minute.Let stand 5 minutes. Fold in whipped topping, chocolate chips, marshmallows and nuts.Spoon into pie crust.Freeze until firm, about 6 hours or overnight. Remove from freezer and let stand 10 minutes to soften before serving. Store leftover pie in freezer.