In a large skillet heat the 1 tablespoon oil over medium heat. Add squash; cook for 5 minutes or until squash is golden brown, turning slices occasionally. Add broth, the 1 tablespoon sage, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Cover and cook 5 minutes longer or until squash is just tender, turning slices once or twice.
In a large salad bowl toss greens with apple and onion; set aside. For dressing, in a small bowl combine vinegar, the 3 tablespoons oil, 1 tablespoon sage, 1/4 teaspoon salt, and 1/4 teaspoon pepper. Drizzle dressing over greens and toss gently. Remove squash with a slotted spoon and place atop salad greens. Sprinkle with cheese. Makes 8 servings.