One 16.25-ounce box chocolate cake mix plus the ingredients for baking it
2 cups freeze-dried raspberries
1/4 cup confectioners' sugar, plus more for dusting, optional
1/2 cup mascarpone cheese
1 teaspoon pure vanilla extract
1 1/2 cups heavy cream
6 ounces semisweet chocolate chips
1/2 cup fresh raspberries