Cut mangoes in chunks. Keep your hands over the bowl as you cut so it can catch any dripping juice.
Puree the mangoes in a blender. It just takes a minute or so.
Start whipping the heavy cream. I have a small (antique at this point lol) electric hand held mixer. Whip for about 8-10 minutes until there are peaks in the whipping cream. When the peaks stay firm and don't lose their shape then the cream is ready.
Add table cream and keep mixing a bit longer (about a minute or so).
Add the mango puree and mix in the lowest setting of the mixer. Test for sweetness.
Use a spoon to transfer in the cups that you will serve the mousse in. Refrigerate for about 2 hours before serving. Add your favorite toppings:)