In a mixing bowl, whisk together the vanilla instant pudding mix and cold milk until well combined. Let it sit for 5 minutes to thicken.

Gently fold the whipped topping into the pudding mixture until fully combined and creamy.

In serving cups or bowls, layer the crushed chocolate sandwich cookies at the bottom, followed by a layer of the pudding mixture.

Add a layer of diced strawberries on top of the pudding, followed by another layer of the pudding mixture.

Top the final layer with fresh blueberries and a sprinkle of crushed chocolate sandwich cookies for a 'dirt' effect.

Garnish with fresh mint leaves if desired. Chill in the refrigerator for about 30 minutes before serving.