In a small mixing bowl, combine the fresh raspberries and granulated sugar. Gently mash a few of the raspberries with the back of a fork to release their juices. Set aside the mixture to macerate for about 10 minutes to enhance the flavor.
In a medium mixing bowl, beat the softened cream cheese using an electric mixer on medium speed until smooth and creamy. Gradually add the powdered sugar and vanilla extract, continuing to beat until the mixture is well combined and free of lumps.
In another large mixing bowl, pour in the heavy whipping cream. Using a handheld or stand mixer, whip the cream on high speed until stiff peaks form. This will create a light and airy texture for the mousse.
Gently fold the whipped cream into the cream cheese mixture using a spatula, carefully combining until fully incorporated. Take care to maintain the light texture.
Now, gently fold in the macerated raspberries along with their juices into the whipped cream mixture. Make sure to retain some small chunks of raspberries for added texture in the mousse.
Prepare the graham cracker crust by mixing the crushed graham crackers, melted butter, and a pinch of sea salt in a small bowl until evenly combined. Divide the mixture between small dessert cups, pressing down slightly to create an even base layer.
Spoon the raspberry cheesecake mousse over the graham cracker crust layer, filling the cups almost to the top but leaving a little space for garnish.
Cover the mousse cups with plastic wrap and refrigerate for at least 2 hours, allowing the flavors to meld and the mousse to set properly.
Just before serving, garnish each mousse cup with a few fresh raspberries atop the mousse, and sprinkle with a bit of crushed graham crackers for a decorative touch.
Notes
Serve the mousse in clear dessert cups to beautifully display the vibrant layers. For an added pop of color, finish each cup with a fresh mint sprig.