In a mixing bowl, combine 1 can of condensed milk and 1 cup of whipped cream. Use an electric mixer on medium speed to whip until light and fluffy, about 3-5 minutes.

While the cream mixture is whipping, peel and slice 2 ripe mangoes into thin pieces, setting aside a few slices for garnishing.

In a rectangular dish, layer graham crackers, followed by the cream mixture and sliced mangoes, repeating this process until finished.

Cover with plastic wrap or a lid and chill in the refrigerator for at least 4 hours or overnight.

Once chilled, slice into squares or rectangles and garnish with mango pieces or whipped cream.