Trouble in Paradys by Stephanie Michels

Psychology professor, Peggy Oster, plans to spend her summer break watching classic sitcoms and reading her stash of romance novels. Instead, she wakes up the first morning of vacation in a strange dimension where all the residents look as if they've been chosen for their roles by a Hollywood casting agent.

Xandro never planned to be wizard; he wants to be a chef. The inept mage can cook a perfect soufflé, but his magic spells leave a lot to be desired. Still, he's not ready to relinquish his court position when a fiery-haired young woman shows up at the castle gate.

Can this couple set aside their differences long enough to rescue the royals, who have been abducted from the throne room? If not, Peggy will be stuck in this strange world with no way to get back to Kansas. Where are all the ruby slippers when a gal needs them?