In bowl, stir together crushed cookies, butter and sugar until moistened; press onto bottom and up the side of pie plate or 9-inch tart pan with removable bottom. Freeze for at least 15 minutes.
In large bowl, using an electric mixer, beat mascarpone with cream on medium until mixture thickens. Sift in icing sugar and vanilla and continue beating until stiff. Cover and refrigerate.
Spoon in and spread mascarpone cream mixture over crust and arrange strawberries overtop. Chill until tart is well chilled and flavours meld.