Whip the cream. If you are using Cool Whip, use directly.
Fold ganache and cream together.
Crush Ferrero Rocher and fold lightly in the mousse.
Keep in the refrigerator until ready to use. Cover the bowl with a cling film.
To assemble the tarts, fill with 2-3 tbsp. of mousse or as required, top or garnish with more crushed Ferrero Rocher or blueberries or nuts of your choice.
Notes
Mousse can be served in shot glasses or phyllo or puff pastry mini bite sized cups or any kind of no-bake tarts.