Combine mango, extra virgin olive oil, white balsamic vinegar and salt in a blender container or small food processor; blend until smooth.
Place spinach, mango, tomato walnuts and green onions in a large bowl.
Drizzle with Mango Vinaigrette and toss well to coat.
Add blue cheese and toss again very lightly. Serve immediately with freshly ground pepper.
Nutrition per serving: 286 calories (58% calories from fat), 20 g total fat, 8 mg cholesterol, 743 mg potassium, 353 mg sodium, 24 g carbohydrates, 5 g fiber, 8 g protein