In 2-quart saucepan, bring broth and squash to a boil over high heat.
Meanwhile, season chicken with salt and, if desired, black pepper. In 4-quart saucepan, heat 1 tablespoon Olive Oil over medium-high heat and brown chicken. Remove chicken and set aside.
In same saucepot, heat 1 tablespoon Olive Oil over medium heat and cook mushrooms, stirring occasionally, 6 minutes or until golden. Remove mushrooms and set aside.
In same saucepot, heat remaining 2 tablespoons Olive Oil over medium-high heat and cook onion, stirring occasionally, 4 minutes or until tender. Add rice and cook, stirring frequently, 1 minute. Stir in squash mixture. Bring to a boil over high heat. Reduce heat to medium-low and cook covered, stirring occasionally, 35 minutes or until rice is tender. Stir in chicken, mushrooms and sage. Cook, stirring occasionally, 1 minute or until chicken is thoroughly cooked. Stir in 4 tablespoons cheese. Garnish with remaining 2 tablespoons cheese.