Place the strawberries, sugar, and vanilla in a large non-stick frying pan. Cook over high heat 1 to 2 minutes or until the sugar has melted and the strawberries have softened slightly. Set aside to cool.
Whisk together the mascarpone, cream, and extra tablespoon of sugar until smooth.
Place half the biscuits in the base of serving bowls, or on serving plates. Spoon the mascarpone mixture onto the biscuits and top with the strawberry mixture followed by the remaining biscuits.