Peel and dice the mangoes, then blend into a smooth puree. You should have about 1½ cups of puree.
In a mixing bowl, whip the chilled heavy cream with powdered sugar and vanilla extract until soft peaks form.
Gently fold the mango puree into the whipped cream using a spatula, being careful not to deflate the mixture.
Once fully combined, spoon or pipe the mousse into serving glasses.
Chill for at least 2 hours to set.
Before serving, garnish with fresh mango cubes or mint leaves for a pop of color and flavor.