Cut the mangoes in half, avoiding the pit.
Use a glass cup to scoop out the mango from the skin. Cut them into thin slices and set aside.
Beat heavy cream with a hand mixer until it starts to turn smooth and creamy.
Add the sweetened condensed milk and vanilla extract.
Continue to beat until the mixture thickens and forms a soft peak.
Spread a thin layer of the whipped cream mixture on the bottom of your chosen pan. Place a layer of graham crackers over.
Spread another layer of whipped cream over the graham crackers.
Cover with sliced mangoes.
Repeat the steps and end with a layer of mangoes on top.
Sprinkle with graham cracker crumbs and cover.
Refrigerate for at least 6 hours, or for a quicker set, freeze for 3 hours.
When it's ready, cut the cake into desired sizes. Enjoy!