For the cocoa: In a medium pot, heat the milk until just simmering. Add the white chocolate chips, vanilla and salt and cook over medium-high heat, whisking, until the chocolate is melted and the mixture is smooth. Bring to a gentle boil, then keep warm.
For the raspberry sauce: Combine the raspberry jam and 2 teaspoons water in a small microwave-safe bowl. Microwave for 20 seconds, then whisk out any lumps.
For the garnish: To build the cocoa, dip the rim of each glass first in the raspberry sauce, then in the freeze-dried raspberries. Pour the remaining raspberry sauce into a squeeze bottle. Pipe a swirl of sauce around the inside of each glass. Portion out the cocoa. Top with whipped cream, a rolled wafer cookie and more raspberry sauce. Serve immediately.