Former CBS Entertainment chairman Nina Tassler is putting her producing hat on.

Less than one year after Tassler left the network executive ranks, she’s put a series into development at ShowtimeVariety has learned.

Showtime has bought a script for “The Middlesteins,” a half-hour series based on the book of the same name. The novel’s author Jami Attenberg will serve as a producer on the television adaptation, which is written by “Girls” scribe Jason Kim. “Life Unexpected” creator Liz Tigelaar will serve as showrunner. Along with Tassler, Tigelaar and Kim, Jonathan Levin will also exec producer. CBS Television Studios is producing.

Published in 2012, “The Middlesteins” is about a suburban couple who splits up after 30 years, partly because of the wife’s obsession with food. The story carries themes of marriage, family and obsession.

The project keeps Tassler in the CBS family, though she has remained in an advisory role with the network since her departure was announced in September 2015. Since exiting her post, which was taken over by now network president Glenn Geller, Tassler published a book “What I Told My Daughter: Lessons from Leaders On Raising the Next Generation of Empowered Women,” co-authored by Variety‘s Cynthia Littleton, which is a collection of essays from female leaders about raising the next generation of powerful women. Having been at CBS for more than 18 years, Tassler is one of the most respected network executives in the biz.

Tigelaar is currently an exec producer on Hulu’s “Casual” and will remain on the show, along with working on “Middlesteins.” Her recent writer/producer credits include A&E’s “Bates Motel,” ABC’s “Nashville,””Astronaut Wives Club,” “Revenge” and “Once Upon A Time.” She created the CW’s “Life Unexpected,” which ran for two seasons in 2010 and 2011. She is repped by UTA.

Kim has written 20 episodes of HBO’s “Girls” on which he’s been a staff writer and story editor. His other credits include “Gracepoint” and “In Treatment.” He is also with UTA.

Attenberg is repped by UTA on behalf of Sterling Lord Literistic.