How to Make It
In a small bowl, whisk the mascarpone until smooth. Add the orange zest and juice along with the liqueur and confectioners' sugar and whisk until smooth.
Preheat the oven to 350°. Arrange the panettone slices on a cookie sheet and bake for about 10 minutes, until golden and heated through, turning once. Transfer the slices to dessert plates and spoon the mascarpone cream on top. Sprinkle with the chocolate shavings and serve.