01 - Combine crushed graham crackers with melted butter in a bowl until evenly moistened. Press firmly into the bottom of an 8-inch square or round pan lined with parchment. 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 minutes.
03 - In a separate bowl, whip cold heavy cream with an electric mixer until stiff peaks form. Gently fold whipped cream into the cream cheese mixture until no white streaks remain.
04 - Spread the cream filling 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.
06 - Spoon raspberry mixture over the cream layer, spreading gently to cover. Refrigerate for at least 2 hours or until completely set.
07 - Garnish with additional fresh raspberries. Slice into squares or wedges and serve cold.