Two kinds of people are loving the Broadway musical roadshow Waitress: fans of Sara Bareilles, the multi-platinum singer-songwriter who created the songs and lyrics; and fans of the 2007 Sundance sleeper hit film, Waitress.

That right there is a big built-in audience, and Broadway in Chicago is drawing them in to the Cadillac Palace Theatre – perhaps many of them new to live stage.

In this vibrant, energy-packed show, Desi Oakley plays Jenna, a young woman in a small town, who faces an unwanted pregnancy, trapped with an extremely abusive husband in a loveless marriage (for her, anyway), while working as a diner waitress at Joe's Diner & Pie Shop. (Jenna was played by Keri Russell in the film.)

Jenna’s specialty is pies, and these will be the key for one day to run her own shop – the successful resolution of the story in the film and a made-to-order happy ending for a Broadway show. The staff and customers of the diner provide the de rigueur corps of sidekicks, supporting characters, and chorus of singers and dancers. The sidekick trio largely makes the show work: Charity Angel Dawson is Becky, the tough waitress with a heart of gold; Lenne Klingaman play the ditzy waitress Becky; and Ryan Dunkin is Cal, the diner cook who looks like a tough biker but is really a pushover.

The show is lively and colorful, and avoids veering into the extremes of “manufactured musical” (like Jimmy Buffet’s Margaritaville) or jukebox show (The Cher Musical) – largely on the basis of Sara Bareilles’ excellence as a songwriter. The emphasis by Bareilles also seems to be on how the mother-to-daughter relationship transmits strength, values and aspirations - the baking is a metaphor for all those life values a mother hands off to her daughter. 

Bareilles’ music is generally not the kind you would associate with a Broadway show - which requires big dance numbers, and sufficient belting to the rafters to telegraph the story to the audience. But Bareilles does provide these numbers, as well the dance sequences (though most are done by seated members of the troupe in Joe's Diner & Pie House). We also get the humorous interludes, duets, and the familiar “advice” song styles, such as “Take It From an Old Man” by the wise old man Joe (Larry Marshall).

The more delicate and emotionally expressive style of Bareilles dominates the second act, with small settings away from Joes Pie Diner – making it really like two plays, Act II bringing us the emotional angst and catharsis – as Jenna finally asserts herself and leaves her horrid husband Earl (Nick Bailey is both a hunk and a dastardly bastard) that we associate with the film. (Interestingly, the film's writer and director also played a supporting role in the movie, the role of Dawn. 

Waitress runs through July 22 at the Cadillac Palace Theatre. You can't go wrong if you see it, especially if you area fan of Sara Bareilles.