Place biscuits in a food processor. Process until finely chopped. Add butter. Process until just combined.
Divide mixture evenly between two 2cm-deep, 10cm (base) heart-shaped loose-based fluted flan tins (see note). Using the back of a metal teaspoon, press mixture over base and sides of tins. Refrigerate for 30 minutes or until firm.
Whisk cream until soft peaks form. Add chocolate. Using a large metal spoon, gently fold until well combined. Carefully remove biscuit cases from tins. Divide cream mixture between cases. Arrange raspberries on top. Serve.