Be careful not to overbeat or your filling will curdle. This is perfect for our Bûche de Noël.
- 1 cup mascarpone, room temperature
Using an electric mixer on low speed, beat mascarpone and salt in a large bowl. With motor running, gradually pour in cream. Increase speed to medium and beat in powdered sugar. Continue beating until mixture forms medium peaks.
Do Ahead: Filling can be made 1 day ahead. Cover and chill. Bring to room temperature before using.