Prepare the Pie Plate: Butter a 10-inch pie plate to ensure easy removal of the pie after chilling.
Cook the Cranberries: In a medium saucepan, combine cranberries, sugar, and water. Bring to a boil, stirring until sugar dissolves. Reduce heat and simmer for about 15 minutes until thickened.
Make the Gingersnap Crust: Mix gingersnap crumbs with melted butter in a bowl. Press into the prepared pie plate.
Blend the Cranberry Puree: Cool the cranberry mixture slightly, then puree until smooth. Chill in the freezer for faster cooling.
Combine Ingredients for Mousse: Blend cooled cranberry puree with cream cheese and vanilla paste until smooth.
Fold in Whipped Topping: Gently fold in thawed Cool Whip until no streaks remain.
Assemble Your Pie: Spread the cranberry mousse evenly into the chilled gingersnap crust.
Chill and Garnish: Chill in the refrigerator for several hours or overnight. Garnish with whipped topping, sugared cranberries, and fresh mint leaves before serving.