Crust: Mix together; pat into a 9 x 13-inch pan.
Bake for 20 minutes at 350°.
Set aside to cool.
Second Layer: Beat until creamy; spread over cool crust.
Third Layer: Prepare and pour over second layer.
Fourth Layer: Top with more Cool Whip.
You may garnish the topping with grated lemon rind, chopped nuts or toasted coconut.