In a large saucepan over medium heat, sauté onions, mushrooms & garlics for 5 minutes in oil. Add rice & broth; bring to a boil. Cover & cook for 30 minutes over medium-low heat or until rice is tender & all liquid has been absorbed. Add salmon cubes. Cook uncovered for 5 minutes, stirring frequently, until salmon begins to flake. Season with salt & pepper; set aside.