In a medium bowl, whisk together the banana pudding mix and cold milk for 2 minutes until thickened.
Fold in half of the whipped topping until fully combined.
Place a few banana slices in each mini graham cracker crust.
Spoon the banana pudding mixture evenly into each crust over the bananas.
Top each pie with the remaining whipped topping.
Chill in the refrigerator for at least 1 hour before serving.
Garnish with crushed graham crackers or vanilla wafers if desired.