Root Beer Float Pie

                                                                                                                                                 
1  (8 ounces) frzn red-fat Cool Whip, thawed, div
3/4 cup cold diet root beer
1/2 cup fat-free milk
1 pk (1 ounce) sugar-free instnt vanilla pudding mix
1 grahm cracker crust (9 inches)
Maraschino cherries, optional


Directions
1. Set aside and refrigerate 1/2 cup whipped topping for garnish. In a large bowl, whisk the root beer, milk and pudding mix for 2 minutes. Fold in half of the remaining whipped topping. Spread into graham cracker crust. 
2. Spread remaining whipped topping over pie. Refrigerate for at least 8 hours or overnight. 
3. Dollop reserved whipped topping over each serving; top with a maraschino cherry if desired. Yield: 8 servings.