In a large mixing bowl, beat the softened cream cheese with an electric mixer until smooth.
Gradually add the powdered sugar and vanilla extract, mixing until well combined.
Gently fold in the whipped topping until the mixture is light and fluffy.
In a separate bowl, combine the strawberries, blueberries, and mini marshmallows.
Carefully fold the fruit mixture into the cream cheese mixture until evenly distributed.
In a serving dish or individual cups, layer the cheesecake mixture and graham cracker crumbs, starting with a layer of cheesecake.
Repeat the layers until all ingredients are used, finishing with a layer of cheesecake on top.
Chill the salad in the refrigerator for at least 1 hour before serving.