First, cut the mangoes into small cubes and set them aside.
In a mixing bowl, beat the chilled all-purpose cream until it becomes smooth and doubles in volume.
Gradually add the chilled condensed milk to the whipped cream, and continue mixing until well blended.
Next, pour the mixture into a container lined with parchment paper for easy removal.
Arrange a layer of graham crackers at the bottom of the dish.
Then, spoon some of the cream mixture over the graham crackers, spreading it evenly.
Distribute some cubed mangoes on top of the cream layer and press them down gently.
After that, add another layer of the cream mixture, spreading it evenly. Then, add the remaining mango cubes and press them down lightly.
Finally, finish by placing another layer of graham crackers on top.
Freeze overnight to allow the layers to set.
Once frozen, remove the edges of the parchment paper, and slice the dessert into cubes for serving.