Preheat your oven to 350°F (175°C).
Place the pre-made tart shell in the oven and bake for 10-12 minutes until golden.
While the shell cools, whip the heavy cream in a bowl until soft peaks form.
In another bowl, combine mascarpone cheese, powdered sugar, and vanilla extract.
Gently fold the whipped cream into the mascarpone mixture until smooth.
Dissolve gelatin in cold water, then heat until melted.
Add melted gelatin to the mascarpone mixture and mix well.
Pour the filling into the cooled tart shell and smooth the top.
Chill in the refrigerator for at least 2 hours until set.
Arrange fresh strawberries on top and glaze with warmed strawberry jam.