01 - Combine crushed graham crackers with melted butter in a bowl until evenly moistened. Press firmly into the bottom of a lined 8-inch square or round pan. Refrigerate for 15 minutes to set.
02 - Beat softened cream cheese, powdered sugar, and vanilla extract in a large bowl until smooth and creamy, about 2-3 minutes.
03 - In a separate bowl, whip cold heavy cream until stiff peaks form. Gently fold whipped cream into the cream cheese mixture until fully incorporated and smooth.
04 - Spread the cream mixture evenly over the chilled crust using an offset spatula.
05 - Mash half the raspberries with raspberry jam and lemon juice in a small bowl. Gently fold in remaining whole raspberries until distributed.
06 - Spoon raspberry mixture over cream layer and spread gently. Refrigerate for at least 2 hours until completely set.
07 - Garnish with additional fresh raspberries before serving. Slice into squares or wedges and serve chilled.