"Dawn tricked me on the radio," Saunders said. "She bet me £100,000 that I don't write it this year, so I have to."
Saunders can be seen in Blandings, a BBC adaptation of PG Wodehouse's novels about the aristocratic family who live at Blandings Castle, but beyond that she says she has not been offered "a lot of stuff" by producers.
She has, though, agreed to start accepting invitations to comedy panel shows, joking: "Yes, they have to have women on them now. It's the law".
The comedian said she was "too scared" to do panel shows in the past. "It's quite intimidating, but the older you get - and after you get past the menopause - you don't care. You think they're just little boys." She will appear in Have I Got News for You in April.
When asked about working on Absolutely Fabulous and French and Saunders, she said: "I've been very lucky in my life that I've been able to work with people who were my friends and are my friends".
She added: "A great thing about being in AbFab is that every air steward brings you champagne, because they think you must want to be drunk all the time".
- Independent