Pour 1/4 cup caramel topping onto bottom of pie crust; sprinkle with 1/2 cup nuts.
In a large bowl, using a whisk, beat next 5 ingredients until blended.
Stir in 1-1/2 cups Cool Whip; spoon into crust.
Refrigerate 1 hour or overnight.
When ready to serve, top with remaining Cool Whip, caramel topping and nuts.