1. Slice 2 of the bananas and arrange in bottom of baked and cooled pastry shell.
2. Pour cold milk into a medium bowl. Add pudding mix and whisk until thoroughly combined. Fold in 1/2 cup of the whipped topping. Pour into pastry shell.
3. Chill at least 3 hours before serving. Garnish with remaining whipped topping and slices of the remaining banana.