Preheat the oven to 180°C conventional (160°C fan-forced).
Combine the mascarpone, brown sugar, eggs and vanilla in a bowl or large jug and whisk until smooth. Gradually add the cream, whisking constantly until pale and smooth.
Using a jug, pour the mix into each tart shell until about three-quarters full. Bake for 8–10 minutes. Remove and let them cool.
Place a raspberry upside down on each tart. Dust with icing sugar and serve.